exynos5-insignal: hwc: Fix usage of GRALLOC_USAGE_PRIVATE_NONSECURE

Change-Id: I30d685b73dd8bd8dd327514b636f8db3e7a890df
exynos5-insignal: libscaler: Add kernel include dir

Change-Id: Ifb056b52f51262e5f1334eba2d72718a86088e53
exynos: add API for reference count of ion fd.

Change-Id: I93e8807ff4a66203c763071bccfcffbfac0463e4
Signed-off-by: SeungBeom Kim <sbcrux.kim@samsung.com>
Bug: 10192533