mfd: pm8921: Include missing linux/module.h

Include <linux/module.h> in order to fix the following errors.

drivers/mfd/pm8921-core.c:209:16: error: expected declaration specifiers or '...' before string constant
drivers/mfd/pm8921-core.c:210:20: error: expected declaration specifiers or '...' before string constant
drivers/mfd/pm8921-core.c:211:16: error: expected declaration specifiers or '...' before string constant
drivers/mfd/pm8921-core.c:212:14: error: expected declaration specifiers or '...' before string constant
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/pm8921-core.c

@@ -14,6 +14,7 @@
 #define pr_fmt(fmt) "%s: " fmt, __func__
 
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/err.h>