Enable panel detection in LK

The panel detection is based on the signature read for the new FP2 display
modules (0x210000).  If the signature does not match lk will probe for the old
display module. The signature set for this module (0xffff) is magic and matches
all read signatures.

FPIIM-904

Change-Id: I8fde68d4018d7b37f22c47b4cc02c4faaa4cc2bd
4 files changed