drm/amdgpu: Fix printk_ratelimit() with DRM_ERROR_RATELIMITED in 'amdgpu_cs_ioctl'

Replaced printk_ratelimit() with its DRM equivalent to avoid flooding of
dmesg logs & hence fixes the following:

WARNING: Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit
+               if (printk_ratelimit())

Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1402,8 +1402,7 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 
 	r = amdgpu_cs_parser_init(&parser, adev, filp, data);
 	if (r) {
-		if (printk_ratelimit())
-			DRM_ERROR("Failed to initialize parser %d!\n", r);
+		DRM_ERROR_RATELIMITED("Failed to initialize parser %d!\n", r);
 		return r;
 	}