ASoC: msm8x16-wcd: add boost option to use it flexible way

Add Boost Option mix control to set one of either
options BOOST_SWITCH, BOOST_ALWAYS, BYPASS_ALWAYS and
BOOST_ON_FOREVER. This mix control can be selected to use one
of the four solutions provided from HW design. Update the codec
driver to support the solutions based on mix control set.

Change-Id: I38924cf35a65d92956cdcf857b7f84400af16f85
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>