omaplfb: Add omaplfb to the kernel tree

omaplfb has dependencies on several kernel components and it will
be easier to maintain it in the kernel tree.

Sync'd to DDK omaplfb patch:
omaplfb: Allocate a clear buffer with 8 pixel stride per GC requirement

Change-Id: I0c781007350fea724aa498f7f8d328db66f9d41c
Signed-off-by: Hemant Hariyani <hemanthariyani@ti.com>
Signed-off-by: Tony Lofthouse <a0741364@ti.com>