[MTD] [NAND] Rename cafe.c to cafe_nand.c and remove the multi-obj magic

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

drivers/mtd/nand/Makefile

@@ -28,4 +28,3 @@ obj-$(CONFIG_MTD_NAND_CM_X270)		+= cmx270_nand.o
 obj-$(CONFIG_MTD_NAND_BASLER_EXCITE)	+= excite_nandflash.o
 
 nand-objs := nand_base.o nand_bbt.o
-cafe_nand-objs := cafe.o