fix(linux): Move AM62LX audio instructions to correct section

Move generic amixer commands for PCM volume control, microphone recording
setup, and HDMI audio switching to proper AM62LX-specific section instead
of being outside the conditional block.

Fixes: 1d0c4fe (feat(linux): Update docs for AM62L Audio)

Signed-off-by: Paresh Bhagat <[email protected]>

Author: paresh-bhagat12

source/linux/Foundational_Components/Kernel/Kernel_Drivers/Audio.rst

@@ -584,7 +584,6 @@ Board-specific instructions
     .. rubric:: User space
        :name: user-space-9
 
-.. _hdmi_audio:
     The hardware defaults are correct for audio playback, the routing is OK
     and the volume is 'adequate' but in case the volume is not correct: