sdma fw isn't released when module exit
Reviewed-by: NHawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: NWenhui Sheng <Wenhui.Sheng@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org