drm/radeon: UVD block on SUMO2 is the same as on SUMO

The chip id for SUMO2 isn't used.

fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=63935

Tested-By: Dave Witbrodt <dawitbro@sbcglobal.net>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>