drm/amdgpu: set new revision id for 10.3.7 GC

Add new revision ID for GC 10.3.7 and set
cg/pg flags.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>