drm/amd/pm: increase time out value when sending msg to SMU

when do S3 stress, low rate that PowerUpVcn message will get response
more than 1s, so here increase the timeout to 2s

Signed-off-by: charles sun <charles.sun@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c

@@ -79,7 +79,7 @@ static void smu_cmn_read_arg(struct smu_context *smu,
 int smu_cmn_wait_for_response(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;
-	uint32_t cur_value, i, timeout = adev->usec_timeout * 10;
+	uint32_t cur_value, i, timeout = adev->usec_timeout * 20;
 
 	for (i = 0; i < timeout; i++) {
 		cur_value = RREG32_SOC15(MP1, 0, mmMP1_SMN_C2PMSG_90);