ASOC: msm: Fix suspend/resume bug in WM8903 driver

In WM8903.c codec driver, wm8903_resume() methods use cached
CLK_SYS_ENA value to update hardware register, which caused
SYS_CLK is disabled and in turn fails audio functioning.

Add a CLK_SYS_ENA widget to enable it everytime when stream
is started from machine driver for Dragonboard.

Change-Id: Id365f59c5705150b14a712142b92727496936fe8
Signed-off-by: Lei Zhou <leizhou@codeaurora.org>