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/board/RPXClassic/RPXClassic.c b/board/RPXClassic/RPXClassic.c
index 9fdf700..5aa713f 100644
--- a/board/RPXClassic/RPXClassic.c
+++ b/board/RPXClassic/RPXClassic.c
@@ -105,7 +105,7 @@
  * board_get_enetaddr -- Read the MAC Address in the I2C EEPROM
  *-----------------------------------------------------------------------------
  */
-void board_get_enetaddr (uchar * enet)
+static void board_get_enetaddr(uchar *enet)
 {
 	int i;
 	char buff[256], *cp;
@@ -142,9 +142,19 @@
 	enet[3] |= 0x80;
 #endif
 
-	printf ("MAC address = %02x:%02x:%02x:%02x:%02x:%02x\n",
-		enet[0], enet[1], enet[2], enet[3], enet[4], enet[5]);
+	printf("MAC address = %pM\n", enet);
+}
 
+int misc_init_r(void)
+{
+	uchar enetaddr[6];
+
+	if (!eth_getenv_enetaddr("ethaddr", enetaddr)) {
+		board_get_enetaddr(enetaddr);
+		eth_putenv_enetaddr("ethaddr", enetaddr);
+	}
+
+	return 0;
 }
 
 void rpxclassic_init (void)