hwc: Add a handle to the can_scale function for future use

A scaling decision may need to account for the size of
a pixel as dss based scaling capability has a relationship
with memory bandwidth

Change-Id: Idd68e11317fb0bb9e5d19f0a0d5818744968a5ab
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
(cherry picked from commit c53e458106e6c4346c092bf34d623ac11848f6bd)
1 file changed