powerpc: mpc52xx: a3m071/a4m2k: Convert to generic board

a3m071 and a4m2k share one config header. So adding the generic board defines
in this one file is enough to convert both boards.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Wolfgang Denk <wd@denx.de>

include/configs/a3m071.h

@@ -14,6 +14,8 @@
 
 #define CONFIG_MPC5200
 #define CONFIG_A3M071			/* A3M071 board */
+#define CONFIG_DISPLAY_BOARDINFO
+#define CONFIG_SYS_GENERIC_BOARD
 
 #define	CONFIG_SYS_TEXT_BASE	0x01000000	/* boot low for 32 MiB boards */