drm/amdgpu: Fix mode2 reset for sienna cichlid

Before this change, sienna_cichlid_get_reset_handler will always
return NULL, although the module parameter reset_method is 3
when loading amdgpu driver.

Signed-off-by: lyndonli <Lyndon.Li@amd.com>
Signed-off-by: Yunxiang Li <Yunxiang.Li@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/sienna_cichlid.c

@@ -40,7 +40,7 @@ static bool sienna_cichlid_is_mode2_default(struct amdgpu_reset_control *reset_c
 	    adev->pm.fw_version >= 0x3a5500 && !amdgpu_sriov_vf(adev))
 		return true;
 #endif
-	return false;
+	return amdgpu_reset_method == AMD_RESET_METHOD_MODE2;
 }
 
 static struct amdgpu_reset_handler *