gpu: drm: drivers: 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>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Sinclair Yeh <syeh@vmware.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/76355db47b31668bb64d996865ceee53bd66b11f.1488285953.git.joe@perches.com
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.h b/drivers/gpu/drm/omapdrm/dss/dss.h
index 56493b2..78f6fc7 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.h
+++ b/drivers/gpu/drm/omapdrm/dss/dss.h
@@ -42,29 +42,26 @@
 
 #ifdef DSS_SUBSYS_NAME
 #define DSSERR(format, ...) \
-	printk(KERN_ERR "omapdss " DSS_SUBSYS_NAME " error: " format, \
-	## __VA_ARGS__)
+	pr_err("omapdss " DSS_SUBSYS_NAME " error: " format, ##__VA_ARGS__)
 #else
 #define DSSERR(format, ...) \
-	printk(KERN_ERR "omapdss error: " format, ## __VA_ARGS__)
+	pr_err("omapdss error: " format, ##__VA_ARGS__)
 #endif
 
 #ifdef DSS_SUBSYS_NAME
 #define DSSINFO(format, ...) \
-	printk(KERN_INFO "omapdss " DSS_SUBSYS_NAME ": " format, \
-	## __VA_ARGS__)
+	pr_info("omapdss " DSS_SUBSYS_NAME ": " format, ##__VA_ARGS__)
 #else
 #define DSSINFO(format, ...) \
-	printk(KERN_INFO "omapdss: " format, ## __VA_ARGS__)
+	pr_info("omapdss: " format, ## __VA_ARGS__)
 #endif
 
 #ifdef DSS_SUBSYS_NAME
 #define DSSWARN(format, ...) \
-	printk(KERN_WARNING "omapdss " DSS_SUBSYS_NAME ": " format, \
-	## __VA_ARGS__)
+	pr_warn("omapdss " DSS_SUBSYS_NAME ": " format, ##__VA_ARGS__)
 #else
 #define DSSWARN(format, ...) \
-	printk(KERN_WARNING "omapdss: " format, ## __VA_ARGS__)
+	pr_warn("omapdss: " format, ##__VA_ARGS__)
 #endif
 
 /* OMAP TRM gives bitfields as start:end, where start is the higher bit