drm/radeon: fix asic gfx values for scrapper asics

Fixes gfx corruption on certain TN/RL parts.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=60389

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Otherwise the kernel might reject our decoding requests.

Signed-off-by: Christian König <christian.koenig at amd.com>
Cc: stable at vger.kernel.org