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>
OMAPLFB: Dont foward compositions to DSSCOMP if overlay is Zero

Do not foward compositions to DSSCOMP in case overlay number
passed by HWC is zero. The dsscomp->num_overlay = 0 means
that there is no primary display and no rendering is required.

Change-Id: If7b582efeb55ce84878d0bfbd19eabd2ebd3afaa
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
Signed-off-by: Dandawate Saket <dsaket@ti.com>
omaplfb: Adds missing length assignment to clear buffer

Adds missing length assignment to the buffdesc used to clear
(fill) the framebuffer. This was leading to problems in the GC
driver buffer geometry validation.

Change-Id: Idc5a64e5cf1974a3053b31bafaf356fe2ed840e0
Signed-off-by: Gustavo Diaz Prado <a0273371@ti.com>
defconfig: Enable omaplfb.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>