drm/amd: avoid suspend on dGPUs w/ s2idle support when runtime PM enabled

dGPUs connected to Intel systems configured for suspend to idle
will not have the power rails cut at suspend and resetting the GPU
may lead to problematic behaviors.

Fixes: e25443d ("drm/amdgpu: add a dev_pm_ops prepare callback (v2)")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1879
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: superm1

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

@@ -2252,8 +2252,7 @@ static int amdgpu_pmops_prepare(struct device *dev)
 	 * DPM_FLAG_SMART_SUSPEND works properly
 	 */
 	if (amdgpu_device_supports_boco(drm_dev))
-		return pm_runtime_suspended(dev) &&
-			pm_suspend_via_firmware();
+		return pm_runtime_suspended(dev);
 
 	/* if we will not support s3 or s2i for the device
 	 *  then skip suspend