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/IAD210.h b/include/configs/IAD210.h
index ca488c6..ea1e706 100644
--- a/include/configs/IAD210.h
+++ b/include/configs/IAD210.h
@@ -67,6 +67,7 @@
 
 /* using this define saves us updating another source file */
 #define CONFIG_BOARD_EARLY_INIT_F 1
+#define CONFIG_MISC_INIT_R
 
 #undef	CONFIG_BOOTARGS
 /* #define CONFIG_BOOTCOMMAND							\