drivers/regulator: include <module.h> for modular max77802 code

This file is built off of a tristate Kconfig option and also contains
modular function calls so it should explicitly include module.h to
avoid compile breakage during header shuffles done in the future.

Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

drivers/regulator/max77802.c

@@ -27,6 +27,7 @@
 #include <linux/gpio.h>
 #include <linux/slab.h>
 #include <linux/gpio/consumer.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>