Move PHY_MICREL and PHY_MICREL_KSZ90X1 to Kconfig

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/k2g_evm_defconfig b/configs/k2g_evm_defconfig
index 7fce8d4..0065d34 100644
--- a/configs/k2g_evm_defconfig
+++ b/configs/k2g_evm_defconfig
@@ -40,6 +40,7 @@
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_PHYLIB=y
+CONFIG_PHY_MICREL=y
 CONFIG_DM_ETH=y
 CONFIG_REMOTEPROC_TI_POWER=y
 CONFIG_DM_SERIAL=y