83xx, uec: split enet_interface in two variables

There's no sensible reason to unite speed and interface type into
one variable.  So split this variable enet_interface into two
vars: enet_interface_type, which hold the interface type and speed.

Also: add the possibility for switching between 10 and 100 MBit
interfaces on the fly, when running in FAST_ETH mode.

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/configs/kmeter1.h b/include/configs/kmeter1.h
index 0327b97..d27b75b 100644
--- a/include/configs/kmeter1.h
+++ b/include/configs/kmeter1.h
@@ -295,7 +295,8 @@
 #define CONFIG_SYS_UEC1_TX_CLK		QE_CLK17
 #define CONFIG_SYS_UEC1_ETH_TYPE	FAST_ETH
 #define CONFIG_SYS_UEC1_PHY_ADDR	0
-#define CONFIG_SYS_UEC1_INTERFACE_MODE ENET_100_RMII
+#define CONFIG_SYS_UEC1_INTERFACE_TYPE RMII
+#define CONFIG_SYS_UEC1_INTERFACE_SPEED 100
 #endif
 
 /*