gpu: drm: amd/radeon: Convert printk(KERN_<LEVEL> to pr_<level>

Use a more common logging style.

Miscellanea:

o Coalesce formats and realign arguments
o Neaten a few macros now using pr_<level>

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 96683f5..9b0b123 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -106,7 +106,7 @@ static int radeon_gem_set_domain(struct drm_gem_object *gobj,
 	}
 	if (!domain) {
 		/* Do nothings */
-		printk(KERN_WARNING "Set domain without domain !\n");
+		pr_warn("Set domain without domain !\n");
 		return 0;
 	}
 	if (domain == RADEON_GEM_DOMAIN_CPU) {
@@ -116,7 +116,7 @@ static int radeon_gem_set_domain(struct drm_gem_object *gobj,
 			r = -EBUSY;
 
 		if (r < 0 && r != -EINTR) {
-			printk(KERN_ERR "Failed to wait for object: %li\n", r);
+			pr_err("Failed to wait for object: %li\n", r);
 			return r;
 		}
 	}