[ARM] pxa: rename mfp.c to mfp-pxa3xx.c to indicate it's pxa3xx specific

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/Makefile

@@ -7,7 +7,7 @@ obj-y				+= clock.o devices.o generic.o irq.o dma.o \
 				   time.o gpio.o
 obj-$(CONFIG_PXA25x)		+= pxa25x.o
 obj-$(CONFIG_PXA27x)		+= pxa27x.o
-obj-$(CONFIG_PXA3xx)		+= pxa3xx.o mfp.o smemc.o
+obj-$(CONFIG_PXA3xx)		+= pxa3xx.o mfp-pxa3xx.o smemc.o
 obj-$(CONFIG_CPU_PXA300)	+= pxa300.o
 obj-$(CONFIG_CPU_PXA320)	+= pxa320.o