m68k: add generic-board support

Add generic-board support for the m68k architecture.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/include/asm-generic/u-boot.h b/include/asm-generic/u-boot.h
index a63a87a..ff697aa 100644
--- a/include/asm-generic/u-boot.h
+++ b/include/asm-generic/u-boot.h
@@ -45,7 +45,7 @@
 	|| defined(CONFIG_E500) || defined(CONFIG_MPC86xx)
 	unsigned long	bi_immr_base;	/* base of IMMR register */
 #endif
-#if defined(CONFIG_MPC5xxx)
+#if defined(CONFIG_MPC5xxx) || defined(CONFIG_M68K)
 	unsigned long	bi_mbar_base;	/* base of internal registers */
 #endif
 #if defined(CONFIG_MPC83xx)