xilinx-ppc4xx-generic: Use common u-boot.lds

Use common ppc4xx linker script for xilinx ppc440 and ppc405 related boards.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S
index 99822d7..2218508 100644
--- a/arch/powerpc/cpu/ppc4xx/start.S
+++ b/arch/powerpc/cpu/ppc4xx/start.S
@@ -267,7 +267,7 @@
 	/* NOTREACHED - board_init_f() does not return */
 #endif
 
-#if defined(CONFIG_SYS_RAMBOOT)
+#if defined(CONFIG_SYS_RAMBOOT) || defined(CONFIG_BOOT_FROM_XMD)
 	/*
 	 * 4xx RAM-booting U-Boot image is started from offset 0
 	 */