Add header for dsscomp and optional bltsville data from Android HWC

In order to support the OMAP4470 GC320 blit IP from HWC, we will
optionally add blit data to the payload of information passed from
HWC to the SGX display driver (OMAPLFB).

Change-Id: Ia764810b0db0d5d7b0e3f777eeabf879b4552282
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
omap_hwc: Describe the api agreement with omaplfb

Change-Id: I1ec9348a661999d536dcec1ba47247289075790e
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
omap_hwc: Adds a flag to hint omaplfb a blit FB is needed

When HWC generates blits a DSS pipe is configured and assigned
for the blit framebuffer, this patch adds a flag to give a
hint to omaplfb to use such pipe when it is present.

This helps in situations where there are not blits but blit
buffers to synchronize with and a blit buffer must be used.
In such case the rgz_items and num_ovls from dsscomp where not
enough data to recognize this scenario.

Change-Id: I70542b5d4a865b783277a46afe5e030d17b90f8f
Signed-off-by: Gustavo Diaz Prado <a0273371@ti.com>
board-tuna.c: disable this hack for now