configs: imx6q_logic: Move CONFIG_PHY_SMSC to defconfig

Since CONFIG_PHY_SMSC was already in Kconfig, move this from
header file to defconfig

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/imx6q_logic_defconfig b/configs/imx6q_logic_defconfig
index a13034d..e7ca358 100644
--- a/configs/imx6q_logic_defconfig
+++ b/configs/imx6q_logic_defconfig
@@ -34,6 +34,7 @@
 CONFIG_NAND=y
 CONFIG_NAND_MXS=y
 CONFIG_PHYLIB=y
+CONFIG_PHY_SMSC=y
 CONFIG_FEC_MXC=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y