regulator: arizona-micsupp: Add missing #include

of.h is presently being included through asm-generic/gpio.h so will not
be included on some architectures, causing implicit declaration errors
for of_get_child_by_name, of_parse_phandle and of_node_put.

This patch adds the direct include that should be there.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/arizona-micsupp.c

@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/bitops.h>
 #include <linux/err.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>