platform: msm_shared: Fix the mask value for cfg register

The mask value for config register is 0x3 in the existing implementation
should be 0x7 instead because of this bits 8 to 10 of the config register
is getting update wrongly while lk updates the clock divider value
resulting in issues with rcg clock rate updates.

Change-Id: I0d161bf08915af7f6e0a0477ca2cc92c95948f16
1 file changed