Add generic, reusable menu code

This will be used first by the pxe code, but is intended to be
generic and reusable for other jobs in U-boot.

Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com>
diff --git a/common/Makefile b/common/Makefile
index fdc4206..8e8dad4 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -177,6 +177,7 @@
 COBJS-$(CONFIG_KALLSYMS) += kallsyms.o
 COBJS-$(CONFIG_LCD) += lcd.o
 COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o
+COBJS-$(CONFIG_MENU) += menu.o
 COBJS-$(CONFIG_MODEM_SUPPORT) += modem.o
 COBJS-$(CONFIG_UPDATE_TFTP) += update.o
 COBJS-$(CONFIG_USB_KEYBOARD) += usb_kbd.o