ASoC: msm: SW workaround for MCLK routing issue in MDM9607

Configure GCC registers to route MCLK source to PLL test pad
instead of GPIO24 as a workaround for HW routing issue
for MCLK in MDM9607

Change-Id: I56e3806226980669cb0dfe15a64ee87465e94ace
Signed-off-by: Viraja Kommaraju <virajak@codeaurora.org>