video: fbdev: bcm2708_fb: Use common compat header

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

The definition of compat_ptr is now common for most platforms, but
requires the inclusion of <linux/compat.h>.
Signed-off-by: NPhil Elwell <phil@raspberrypi.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/video/fbdev/bcm2708_fb.c

@@ -38,6 +38,7 @@
 #include <linux/cred.h>
 #include <soc/bcm2835/raspberrypi-firmware.h>
 #include <linux/mutex.h>
+#include <linux/compat.h>
 
 //#define BCM2708_FB_DEBUG
 #define MODULE_NAME "bcm2708_fb"