Add another firmware load type AMDGPU_FW_LOAD_RLC_AUTO to support firmware
autoloading new feature in gfx10.

This flag can be leveraged for future engines that need autoload fw.
Signed-off-by: NLe.Ma <Le.Ma@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>