ARC: nsim_{700|700be|hs38be}_defconfigs: Disable networking

We don't have yet any brc700 or big-enadian platforms with networking
support to run this particular configuration.

Whenever QEMU for ARC supports arc700 or big-endian targets we may revisit
this one.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/configs/nsim_700_defconfig b/configs/nsim_700_defconfig
index 2d4a58b..6a38e2c 100644
--- a/configs/nsim_700_defconfig
+++ b/configs/nsim_700_defconfig
@@ -14,6 +14,7 @@
 CONFIG_OF_EMBED=y
 CONFIG_DEFAULT_DEVICE_TREE="nsim"
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+# CONFIG_NET is not set
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
 CONFIG_DEBUG_UART_SHIFT=2