arm: mmp: make private clock definition exclude from common clock

# Makefile for Marvell's PXA168 processors line

#

obj-y				+= common.o clock.o devices.o time.o irq.o

obj-y				+= common.o devices.o time.o irq.o

# SoC support

obj-$(CONFIG_CPU_PXA168)	+= pxa168.o

obj-$(CONFIG_CPU_PXA910)	+= pxa910.o

obj-$(CONFIG_CPU_MMP2)		+= mmp2.o sram.o

ifeq ($(CONFIG_COMMON_CLK), )

obj-y				+= clock.o

endif

ifeq ($(CONFIG_PM),y)

obj-$(CONFIG_CPU_PXA910)	+= pm-pxa910.o

obj-$(CONFIG_CPU_MMP2)		+= pm-mmp2.o