ucmlint: Warn for missing CaptureChannelMap on Internal Mic

BUG=b:382980984
BUG=b:405834519
TEST=../../../../overlays/overlay-volteer/chromeos-base/chromeos-bsp-volteer/files/lillipup/audio/ucm-config/sof-rt5682.lillipup

Change-Id: Ieba152848d3a216d6e0190b98dadf504e57db31e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/6382056
Tested-by: [email protected] <[email protected]>
Reviewed-by: Yu-Hsuan Hsu <[email protected]>
Commit-Queue: Li-Yu Yu <[email protected]>

Author: afq984

devtools/ucmlint/ucmlint.py

@@ -443,6 +443,11 @@ def lint_device(card_name: str, dev: Section):
                 'See "Switch events" in include/uapi/linux/input-event-codes.h'
             )
 
+    # check CaptureChannelMap
+    if t == DeviceType.InternalMic:
+        if dev.value.get('CaptureChannelMap') is None:
+            dev.value.warning(f'Value CaptureChannelMap is required for `{dev.name}`.')
+
     # check EDIDFile
     if t == DeviceType.HDMI:
         if dev.value.get('EDIDFile') is None: