[ARM] 5436/1: ARM: OMAP: Fix compile for rx51

This fixes a compile error caused by a mismerge while rebasing the patch:

linux-2.6/arch/arm/mach-omap2/board-rx51-peripherals.c:354:
undefined reference to `twl4030_mmc_init'

Looks like I need to also update my build scripts, just grepping for error:
in the logs is not obviously enough..
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap2/Makefile

@@ -47,6 +47,8 @@ obj-$(CONFIG_MACH_OMAP_3430SDP)		+= board-3430sdp.o \
 
 obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51.o \
 					   board-rx51-peripherals.o \
+					   mmc-twl4030.o
+
 # Platform specific device init code
 ifeq ($(CONFIG_USB_MUSB_SOC),y)
 obj-y					+= usb-musb.o