net: Add SMC911X driver to Kconfig, convert

We add the various SMC91XX symbols to drivers/net/Kconfig and then this
converts the following to Kconfig:
   CONFIG_SMC911X
   CONFIG_SMC911X_BASE
   CONFIG_SMC911X_16_BIT
   CONFIG_SMC911X_32_BIT

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Apply to the rest of the tree, re-squash old and new patch]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/vexpress_aemv8a.h b/include/configs/vexpress_aemv8a.h
index 316198a..6203e14 100644
--- a/include/configs/vexpress_aemv8a.h
+++ b/include/configs/vexpress_aemv8a.h
@@ -102,13 +102,7 @@
 /* Size of malloc() pool */
 #define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + (8 << 20))
 
-/* Ethernet Configuration */
-#ifdef CONFIG_TARGET_VEXPRESS64_JUNO
-/* The real hardware Versatile express uses SMSC9118 */
-#define CONFIG_SMC911X			1
-#define CONFIG_SMC911X_32_BIT		1
-#define CONFIG_SMC911X_BASE		(0x018000000)
-#else
+#ifndef CONFIG_TARGET_VEXPRESS64_JUNO
 /* The Vexpress64 simulators use SMSC91C111 */
 #define CONFIG_SMC91111			1
 #define CONFIG_SMC91111_BASE		(0x01A000000)