drm/amdgpu: bump the DRM version for GDS ENOMEM fixes

So userspace knows when this fix is available.

Signed-off-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>