platform: msm8226: Cleanup MDSS clock APIs
platform: msm8226: Cleanup MDSS clock APIs

Reorganize the APIs used to enable/disable the clocks
needed to display splash screen. The clocks have been
organized into two separate groups - one consisting of
all the bus clocks and the other consisting of DSI branch
clocks. This is needed in order to be able to call in to
TZ to restore MDP security configurations before accessing
the MDP registers.

CRs-Fixed: 552293
Change-Id: I7baf0f16737f8b674cc379c494828042c006664d

mozilla-b2g/fairphone2_kernel_lk,t2m-foxfone/android_kernel_lk,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader,t2m-foxfone/kernel_lk,mozilla-b2g/kernel_lk,Redmi-dev/android_bootable_lk,mozilla-b2g/kernel_lk,idor/dk50-bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,lg-devs/g2-bootloader,Redmi-dev/android_bootable_lk,t2m-foxfone/android_kernel_lk,t2m-foxfone/kernel_lk,Redmi-dev/android_bootable_lk,mozilla-b2g/fairphone2_kernel_lk,Redmi-dev/android_bootable_lk,lg-devs/g2-bootloader,idor/dk50-bootable_bootloader_lk,mozilla-b2g/fairphone2_kernel_lk,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader,t2m-foxfone/kernel_lk,idor/dk50-bootable_bootloader_lk,idor/dk50-bootable_bootloader_lk,mozilla-b2g/kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/kernel_lk,lg-devs/g2-bootloader,t2m-foxfone/kernel_lk,t2m-foxfone/kernel_lk,idor/dk50-bootable_bootloader_lk,t2m-foxfone/android_kernel_lk,Redmi-dev/android_bootable_lk,mozilla-b2g/kernel_lk