boards: move board_get_enetaddr() into board-specific init

The environment is the canonical storage location of the mac address, so
we're killing off the global data location and moving everything to
querying the env directly.

Rather than have the common ppc code have board-specific hooks, move the
board_get_enetaddr() function into the board-specific init functions.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
CC: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/configs/MBX860T.h b/include/configs/MBX860T.h
index 4cb3a69..0c28710 100644
--- a/include/configs/MBX860T.h
+++ b/include/configs/MBX860T.h
@@ -50,6 +50,8 @@
 #undef	CONFIG_8xx_TFTP_MODE
 #endif
 
+#define CONFIG_MISC_INIT_R
+
 #define CONFIG_DRAM_SPEED	(CONFIG_8xx_BUSCLOCK)	/* MHz		*/
 #define CONFIG_BOOTCOMMAND	"bootm FE020000"	/* autoboot command */
 #define CONFIG_BOOTARGS		" "