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/configs/peach-pi_defconfig b/configs/peach-pi_defconfig
index 6900f3d..26b3109 100644
--- a/configs/peach-pi_defconfig
+++ b/configs/peach-pi_defconfig
@@ -38,6 +38,9 @@
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_GIGADEVICE=y
 CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_NETDEVICES=y
+CONFIG_SMC911X=y
+CONFIG_SMC911X_BASE=0x5000000
 CONFIG_DM_PMIC=y
 CONFIG_PMIC_TPS65090=y
 CONFIG_DM_REGULATOR=y