target: msm8974: Support panel selection through fastboot cmd
target: msm8974: Support panel selection through fastboot cmd

Allow user to select the different panel through fastboot
oem command for msm8974 target. If target does not find
the panel selected by user, it will boot up with default
panel configured for respective platform type.

Change-Id: Ide567d40f2e8e60453e06debd71982a4b36f5e98

t2m-foxfone/android_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,lg-devs/g2-bootloader,lg-devs/g2-bootloader,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader,lg-devs/g2-bootloader,t2m-foxfone/android_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,t2m-foxfone/android_kernel_lk,lg-devs/g2-bootloader,t2m-foxfone/android_kernel_lk