audio: usb: Set endianness mixer control

Derive supported endianness from usb stream_info
and use it to configure USB interface. This is
needed to configure AFE with the appropriate
endianness supported by a USB DAC.

CRs-Fixed: 2003730
Change-Id: I0b0af613743c00c2704e4732a8ddb8d43adbd20f
1 file changed