Improve TC358743 HDMI audio quality

[pennycoders]

Optimize TC358743 audio capture to eliminate artifacts and improve audio fidelity:

• Disable automatic audio muting (AUTO_CMD0/AUTO_CMD1) to prevent ACR PLL instability during silence periods
• Reduce audio initialization delay from 500ms to 200ms for faster startup after HDMI format changes
• Disable sample rate-based muting (FS_MUTE) to prevent false muting
• Tighten ACR clock tolerance from 976/1976/3906 PPM to 122/122/244 PPM for 8-32x better audio clock tracking precision
• Increase divider settling time from 100ms to 600ms to eliminate artifacts during video resolution changes
• Explicitly configure 24-bit I2S sample depth
• Add V4L2_CTRL_FLAG_VOLATILE to audio_sampling_rate control to enable dynamic sample rate detection from userspace

These changes eliminate crackling and clipping artifacts during silence transitions and format changes, while providing significantly tighter audio clock synchronization with the HDMI source. The 122/244 PPM tolerance provides excellent audio quality while maintaining wide compatibility with consumer HDMI devices (typically 20-50 PPM crystal accuracy).

The sample rate detection capability allows userspace applications to query the actual HDMI audio sample rate via V4L2 ioctl, which is critical for supporting non-48kHz HDMI sources (e.g., 44.1kHz from Armbian SBC or other devices). This prevents sample rate mismatches that would cause audio distortion during resampling.