drm_hwcomposer: remove unnecessary external includes

Linking to libraries will add necessary include paths, so we don't need to
list them explicitly.

Still need libsync for sw_sync.h until this dependency is removed.

Tested-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Reviewed-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Signed-off-by: Rob Herring <robh@kernel.org>
1 file changed