MIPS: xilfpga: switch to CONFIG_OF_SEPARATE

Fix the Kconfig warning to not use CONFIG_OF_EMBED in defconfigs.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/configs/imgtec_xilfpga_defconfig b/configs/imgtec_xilfpga_defconfig
index 4fe7531..cea6424 100644
--- a/configs/imgtec_xilfpga_defconfig
+++ b/configs/imgtec_xilfpga_defconfig
@@ -17,7 +17,6 @@
 CONFIG_CMD_PING=y
 CONFIG_CMD_TIME=y
 # CONFIG_ISO_PARTITION is not set
-CONFIG_OF_EMBED=y
 CONFIG_DEFAULT_DEVICE_TREE="nexys4ddr"
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_NETCONSOLE=y