Move PHYLIB to Kconfig

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/T1040D4RDB_SPIFLASH_defconfig b/configs/T1040D4RDB_SPIFLASH_defconfig
index 8e7dd1d..14a7f9e 100644
--- a/configs/T1040D4RDB_SPIFLASH_defconfig
+++ b/configs/T1040D4RDB_SPIFLASH_defconfig
@@ -37,6 +37,7 @@
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_PHYLIB=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
 CONFIG_SYS_NS16550=y