drm/amd/display: remove GRPH_SURFACE_UPDATE_IMMEDIATE_EN field programming

This is causing asserts for dce 8 and 10 since they do not contain this
field. It is also unnecessary for later DCEs as it is left in it's
default state of 0

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>