target: msm8996: support dsc panel selection through fastboot
target: msm8996: support dsc panel selection through fastboot

Add dsc panel selection through fastboot oem command
till bootloader support is not present.

Change-Id: Ic58d8cae7eee6e8069c4ed01107d0017e8a9084c

Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk