Extcon: renamed files to comply with the standard naming.

Replaced '_' with '-' in the extcon file names, which has been bogging
since new drivers have been using the standard naming.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 88961b3..9c0682da 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -2,8 +2,8 @@
 # Makefile for external connector class (extcon) devices
 #
 
-obj-$(CONFIG_EXTCON)		+= extcon_class.o
-obj-$(CONFIG_EXTCON_GPIO)	+= extcon_gpio.o
+obj-$(CONFIG_EXTCON)		+= extcon-class.o
+obj-$(CONFIG_EXTCON_GPIO)	+= extcon-gpio.o
 obj-$(CONFIG_EXTCON_MAX77693)	+= extcon-max77693.o
 obj-$(CONFIG_EXTCON_MAX8997)	+= extcon-max8997.o
 obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o