ARM: UniPhier: enable CONFIG_NET_RANDOM_ETHADDR

Since commit 92ac52082140 (net: Remove all references to
CONFIG_ETHADDR and friends), the ethernet device on UniPhier boards
is not working because of the incorrect (all-zero) MAC address.

Enable CONFIG_NET_RANDOM_ETHADDR to generate the random one.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/ph1_sld8_defconfig b/configs/ph1_sld8_defconfig
index fc79866..3e763dc 100644
--- a/configs/ph1_sld8_defconfig
+++ b/configs/ph1_sld8_defconfig
@@ -3,6 +3,7 @@
 CONFIG_SPL_DM=y
 CONFIG_MACH_PH1_SLD8=y
 CONFIG_PFC_MICRO_SUPPORT_CARD=y
+CONFIG_NET=y
 CONFIG_SYS_TEXT_BASE=0x84000000
 CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-sld8-ref"
 CONFIG_FIT=y
@@ -31,6 +32,7 @@
 CONFIG_CMD_NFS=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_TIME=y
+CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_NAND_DENALI=y
 CONFIG_SYS_NAND_DENALI_64BIT=y
 CONFIG_NAND_DENALI_SPARE_AREA_SKIP_BYTES=8