mfd: max77620: Allow building as a module

The driver works fine as a module, so allowing building as such.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

drivers/mfd/Kconfig

@@ -846,7 +846,7 @@ config MFD_MAX77541
 	  There are regulators and adc.
 
 config MFD_MAX77620
-	bool "Maxim Semiconductor MAX77620 and MAX20024 PMIC Support"
+	tristate "Maxim Semiconductor MAX77620 and MAX20024 PMIC Support"
 	depends on I2C=y
 	depends on OF
 	select MFD_CORE

drivers/mfd/max77620.c

@@ -29,6 +29,7 @@
 #include <linux/mfd/core.h>
 #include <linux/mfd/max77620.h>
 #include <linux/init.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
@@ -700,3 +701,7 @@ static struct i2c_driver max77620_driver = {
 	.id_table = max77620_id,
 };
 builtin_i2c_driver(max77620_driver);
+
+MODULE_DESCRIPTION("Maxim Semiconductor MAX77620 and MAX20024 PMIC Support");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL");