drm/amdgpu: add rlc iram and dram firmware support

Support to load RLC iram and dram ucode when RLC firmware struct use v2.2

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>