Staging: dream: fix gpio_input compilation

gpio_* drivers still need drivers in staging. Yes, that will need to
be fixed, but at least fix compilation for now.
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/dream/Makefile

+EXTRA_CFLAGS=-Idrivers/staging/dream/include
 obj-$(CONFIG_MSM_ADSP)		+= qdsp5/ smd/
 obj-$(CONFIG_MSM_CAMERA)	+= camera/
 obj-$(CONFIG_INPUT_GPIO)	+= gpio_axis.o gpio_event.o gpio_input.o gpio_matrix.o gpio_output.o