topology2: add WebRTC HPF/AGC capture chaining, HDA AEC, and PTL targets - #11426

Instantiate webrtc-hpf (DC/<80 Hz removal) and webrtc-agc (digital gain
control and saturation limiter) in webrtc-ns-capture.conf alongside
webrtc-vad and webrtc-ns to form the complete WebRTC voice
pre-processing chain.

Add PTL nocodec topology targets (sof-ptl-nocodec-webrtc-{ns,aec,ns2})
in tplg-targets.cmake alongside the existing TGL targets.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Add an optional WebRTC AEC capture variant in cavs-mixin-mixout-hda.conf
using webrtc-aec-capture, tap the analog playback pipeline after drc.2.1
via module-copier.2.2 to feed the speaker reference signal to
webrtc-aec.3.1 input pin 1, and keep the AEC mixer control names within
the 44-byte ALSA control name limit.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Add WebRTC NS/NS2/AEC topology targets and platform/intel configs for
DMIC, SDW DMIC, and SDW Jack capture chains (including pipeline ID 450
for SDW Jack WebRTC capture, explicit module-copier S32->S16 conversion
after 48->16 kHz SRC, and matching 16 kHz / DMIC1_RATE format sets on
webrtc-vad).

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Compile external WebRTC static libraries (AECm, NS, RNNoise, libfvad) with
-fno-pic -fno-pie -mlongcalls -mtext-section-literals -DNDEBUG when
building relocatable Xtensa LLEXTs. Without these flags, GCC emits
R_XTENSA_PLT internal relocations that the Zephyr LLEXT loader cannot
resolve against static archive symbols.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Zephyr sets LL_EXTENSION_BUILD rather than LLEXT_MODULE when compiling
relocatable LLEXT sources; check both macros in the WebRTC shim files so
malloc/free wrappers and non-userspace BSS placement match the build
mode. Also remove the unused <rtos/panic.h> include and k_panic() call
from webrtc_aec-shims.c.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Provide __attribute__((weak)) soft-float logf, log10f, expf, cosf, sinf,
and atanf shims compiled unconditionally so both relocatable LLEXT and
monolithic builds (e.g. CAVS 2.5 where CONFIG_LIBRARY_MANAGER=n) link
without an external libm or duplicate symbol collisions. Implement
log2f and exp2f via range reduction into [sqrt(2)/2, sqrt(2)] and
[-0.5, 0.5] so inputs across the full positive domain stay accurate and
continuous.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

When CONFIG_USERSPACE is enabled, webrtc_vad runs in a user thread and
invokes notifier_event() on VAD state changes. Instead of exporting raw
notifier_event() directly to LLEXT/userspace (where host_notify state is
not partitioned for user access), expose notifier_event() via a Zephyr
__syscall wrapper and validate the event type and caller buffer in
z_vrfy_notifier_event().

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Set init_config = "1" in webrtc_aec.toml so topology generates the ext
init_config metadata expected by IPC4 module setup, and guard
input_pins[1] access with nb_input_pins > 1 && input_pins != NULL in
webrtc_aec_prepare() so single-source preparation without a second pin
descriptor cannot dereference past input_pins.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Re-resolve mic and playback-reference sources in webrtc_aec_process()
and webrtc_aec_is_ready_to_process() because IPC4 playback pipelines may
bind or unbind dynamically while capture is active, and drop excess
reference frames so playback backpressure does not stall capture or overflow
the reference ring buffer.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>