msm: acpuclock-7627: Correct the mask for disabling the pll4
msm: acpuclock-7627: Correct the mask for disabling the pll4

The current mask for disabling the PLL4 before reprogramming
would lead to resetting the pll_enabled bitmap, which would
lead to wrong information while disabling the unused enabled PLL
at the end of the switch.

Change-Id: Id30865d2f68994d9ff4f2c0126322093763c4650
Signed-off-by: Trilok Soni <09ba25e8287174427a14c0c4fcd42a11f58bc40b@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas