drm/drm_print: Minimize include footprint

Reduce drm_print.h to include or forward the minimal set of
files/symbols - to minimize the impact of the files that includes this
header file.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

include/drm/drm_print.h

@@ -26,14 +26,13 @@
 #ifndef DRM_PRINT_H_
 #define DRM_PRINT_H_
 
-#include <linux/compiler.h>
-#include <linux/printk.h>
-#include <linux/seq_file.h>
+#include <linux/dev_printk.h>
 #include <linux/device.h>
-#include <linux/debugfs.h>
-#include <linux/dynamic_debug.h>
+#include <linux/printk.h>
 
-#include <drm/drm.h>
+struct debugfs_regset32;
+struct seq_file;
+struct device;
 
 /* Do *not* use outside of drm_print.[ch]! */
 extern unsigned long __drm_debug;