display-hal: fix compile errors with 5.4 kernel

Add uapi/include/display to include search path and add sde_drm.h
to fix compile errors with 5.4 kernel. This change is backward
compatible and is also working in 4.14 kernel.

Change-Id: I47b025301fa53fbd4bc1cceb013db3648b5a61cd
Signed-off-by: Liang Liu <lianliu@codeaurora.org>
4 files changed