Manual Test case - check-audio-privacy-during-D3

Added manual test case veryfing mic privacy functionality
during D3 state on linux platforms.

Signed-off-by: Patryk Kuniecki <patryk.kuniecki@intel.com>

Author: pkunieck

test-case/manual/check-audio-privacy-during-D3.md

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+# Verify audio privacy (hard mute) functionality during D3 state
+Verify audio privacy (hard mute) functionality in Linux in D3 state
+
+## Preconditions
+1. The RVP should have active audio endpoints.
+2. The RVP should have a functional hard mute switch or toggle.
+3. Enable BIOS settings:
+   * Microphone Privacy Mode = "HW managed Microphone Privacy"
+   * Enable corresponding codec options, e.g., SNDW#3 [x] for SoundWire.
+   * Enable DMIC option, e.g., DMIC [x] for DMIC
+4. Make sure UCM is up to date
+   * Copy the ucm and ucm2 trees to the alsa-lib configuration directory (usually located in /usr/share/alsa) including symlinks
+   * Reference: https://github.com/alsa-project/alsa-ucm-conf/
+
+## Test Description
+* Verification of audio privacy (hard mute) functionality during suspension in D3 state in linux system.
+* Should not capture audio samples when the audio privacy switch is turned ON during D3 state.
+* Should capture audio samples when the audio privacy switch is turned OFF during D3 state.
+
+## Steps to Execute
+1. System is booted in the OS
+2. Capture audio via 3.5mm jack ports:
+    ```bash
+    arecord -Dhw:0,0 -c 2 -r 48000 -f S16_LE /tmp/test_sample_mute_during_d3.wav -vvv
+    ```
+3. Enter D3 state via command:
+    ```bash
+    sudo rtcwake -m mem --seconds 30
+    ```
+4. Turn ON the audio privacy switch. Led indicator should be turned ON.
+5. Exit D3 state, check on the file if audio was muted in D3 state
+6. Capture audio via 3.5mm jack ports:
+    ```bash
+    arecord -Dhw:0,0 -c 2 -r 48000 -f S16_LE /tmp/test_sample_unmute_during_d3.wav -vvv
+    ```
+7. Enter D3 state via command:
+    ```bash
+    sudo rtcwake -m mem --seconds 30
+    ```
+8. Turn OFF the audio privacy switch. Led indicator should be turned OFF.
+9. Exit D3 state, check on the file if audio was unmuted in D3 state
+10. Check the dmesg log.
+
+## Expected Results
+1. No dmesg errors, jack device should be visible in system.
+2. Recording should start without problems.
+3. Device should enter D3 state.
+4. The MIC mute LED should glow.
+5. The microphone is completely disabled during D3 state, and no audio is captured or transmitted.
+6. Recording should start without problems.
+7. Device should enter D3 state.
+8. The MIC mute LED should turn OFF.
+9. The microphone is completely enabled during D3 state, resuming normal functionality, capturing and transmitting audio.
+10. No audio errors or failures should be present in the dmesg log.