Convert CONFIG_MACB to Kconfig

This converts the following to Kconfig:
   CONFIG_MACB

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/taurus_defconfig b/configs/taurus_defconfig
index 1720e1d..eaede09 100644
--- a/configs/taurus_defconfig
+++ b/configs/taurus_defconfig
@@ -87,7 +87,7 @@
 CONFIG_SYS_NAND_U_BOOT_OFFS=0x20000
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
-CONFIG_PHYLIB=y
+CONFIG_MACB=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_AT91=y
 CONFIG_SPECIFY_CONSOLE_INDEX=y