ASoC: wcd9xxx: Enable headset in high performance

Invoke class AB mode for headset path when sample rate
is set to 192KHz and bit width is set to 24. Change enables
headset path in Ultra High Quality Audio(UHQA)mode.

Change-Id: I6cd05952114b88602fc9dcc883d83a39214311b9
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>
ASoC: wcd9306: Enable class AB and expose sysfs

Conflicts:
	drivers/misc/Kconfig
	drivers/misc/Makefile
ASoC: wcd9306: Fix req_clsh_state mismatch