Convert CS8900 Ethernet driver to CONFIG_NET_MULTI API

All in-tree boards that use this controller have CONFIG_NET_MULTI added
Also:
  - changed CONFIG_DRIVER_CS8900 to CONFIG_CS8900
  - changed CS8900_BASE to CONFIG_CS8900_BASE
  - changed CS8900_BUS?? to CONFIG_CS8900_BUS??
  - cleaned up line lengths
  - modified VCMA9 command function that accesses the device
  - removed MAC address initialization from lib_arm/board.c

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
Tested-by: Wolfgang Denk <wd@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/ep7312.h b/include/configs/ep7312.h
index 630fff3..e151faa 100644
--- a/include/configs/ep7312.h
+++ b/include/configs/ep7312.h
@@ -47,10 +47,11 @@
 /*
  * Hardware drivers
  */
-#define CONFIG_DRIVER_CS8900	1	/* we have a CS8900 on-board */
-#define CS8900_BASE		0x20000000
-#define CS8900_BUS16		1
-#undef  CS8900_BUS32
+#define CONFIG_NET_MULTI
+#define CONFIG_CS8900		/* we have a CS8900 on-board */
+#define CONFIG_CS8900_BASE	0x20000000
+#define CONFIG_CS8900_BUS16
+#undef  CONFIG_CS8900_BUS32
 
 /*
  * select serial console configuration