remove CONFIG_ANDROID for ashmem

see 1045a06 ("remove CONFIG_ANDROID") set all
obj-$(CONFIG_ANDROID) to y.
set it for drivers/staging/Makefile to make CONFIG_ASHMEM to
build ashmem

Author: opsiff

drivers/staging/Makefile

@@ -17,7 +17,7 @@ obj-$(CONFIG_IIO)		+= iio/
 obj-$(CONFIG_FB_SM750)		+= sm750fb/
 obj-$(CONFIG_USB_EMXX)		+= emxx_udc/
 obj-$(CONFIG_MFD_NVEC)		+= nvec/
-obj-$(CONFIG_ANDROID)		+= android/
+obj-y		+= android/
 obj-$(CONFIG_STAGING_BOARD)	+= board/
 obj-$(CONFIG_LTE_GDM724X)	+= gdm724x/
 obj-$(CONFIG_SB105X)		+= sb105x/