rockchip: evb-px5: disable NET

PX5 evb has no ETH port, so disable it.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/evb-px5_defconfig b/configs/evb-px5_defconfig
index f9b17be..2d18da6 100644
--- a/configs/evb-px5_defconfig
+++ b/configs/evb-px5_defconfig
@@ -45,7 +45,7 @@
 CONFIG_TPL_OF_PLATDATA=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
-CONFIG_NET_RANDOM_ETHADDR=y
+# CONFIG_NET is not set
 CONFIG_TPL_DM=y
 CONFIG_REGMAP=y
 CONFIG_SPL_REGMAP=y