m68k: add generic-board support

Add generic-board support for the m68k architecture.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/arch/m68k/include/asm/config.h b/arch/m68k/include/asm/config.h
index 9c4d3fb..7590842 100644
--- a/arch/m68k/include/asm/config.h
+++ b/arch/m68k/include/asm/config.h
@@ -7,6 +7,9 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
+#define CONFIG_SYS_GENERIC_BOARD
+#define CONFIG_SYS_GENERIC_GLOBAL_DATA
+
 #define CONFIG_NEEDS_MANUAL_RELOC
 
 #define CONFIG_LMB