dev: gcdb: display: assign panel bpp before use
dev: gcdb: display: assign panel bpp before use

Assign panel bpp before it is used else default
value will be taken for all cases.

Change-Id: Ic98d2f479aee9733896b473e92f6adabfd218865

Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,efidroid/lk,efidroid/lk,efidroid/lk,efidroid/lk,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,efidroid/lk,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk