drm/amdgpu: suppress the compile warning about 64 bit type

drm/amdgpu: suppress the compile warning about 64 bit type

Suppress the compile warning below:
drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c:1292
gfx_v11_0_rlc_backdoor_autoload_copy_ucode() warn: should '1 << id' be a 64 bit type?

Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Evan Quan <[email protected]>
Reviewed-by: Guchun Chen <[email protected]>
Acked-by: Christian König <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>