Input: rename input.ko into input-core.ko

This will allow building input core module from several files
which is needed for the reworked force feedback support.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/Makefile

@@ -4,7 +4,9 @@
 
 # Each configuration option enables a list of files.
 
-obj-$(CONFIG_INPUT)		+= input.o
+obj-$(CONFIG_INPUT)		+= input-core.o
+input-core-objs := input.o
+
 obj-$(CONFIG_INPUT_MOUSEDEV)	+= mousedev.o
 obj-$(CONFIG_INPUT_JOYDEV)	+= joydev.o
 obj-$(CONFIG_INPUT_EVDEV)	+= evdev.o