am62x: rgx_um: add missing file from DDK 1.18
Add OpenCL lib from DDK 1.18@6276027 to fix CtsUsesNativeLibraryTest:
cannot locate symbol "PVRSRVDebugAssertFail" referenced by "/vendor/lib64/libPVROCL.so
Signed-off-by: Guillaume La Roque glaroque@baylibre.com