drivers: char: vcio: 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/char/broadcom/vcio.c

@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/compat.h>
 #include <soc/bcm2835/raspberrypi-firmware.h>
 
 #define MBOX_CHAN_PROPERTY 8