asoc: msm_sdw: Add mutex handling to protect dev_up access

A race condition might occur between setting the int_mclk1_enabled
and dev_up flags in SSR/PDR use cases. Protect the dev_up
flag also with the same mutex as int_mclk1_enabled to fix this.

Change-Id: I2216ac2aa52a52cbb60c15b2d2665e1da2315f95
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>