MIPS: Octeon: Fix build error if CONFIG_MTD=n

CFLAGS_setup.o = -I$(src)/../../../scripts/dtc/libfdt

obj-y := cpu.o setup.o serial.o octeon-platform.o octeon-irq.o csrc-octeon.o

obj-y += dma-octeon.o flash_setup.o

obj-y += dma-octeon.o

obj-y += octeon-memcpy.o

obj-y += executive/

obj-$(CONFIG_MTD)		      += flash_setup.o

obj-$(CONFIG_SMP)		      += smp.o

obj-$(CONFIG_OCTEON_ILM)	      += oct_ilm.o