boards: Disable NET on platforms without NETDEVICES

None of these platforms enabled a networking devices, and disabled
CMD_NET. Given that we used to gate network support on CMD_NET rather
than NET, we disable CONFIG_NET on these platforms now.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/thunderx_88xx_defconfig b/configs/thunderx_88xx_defconfig
index 5c24b38..0c71b29 100644
--- a/configs/thunderx_88xx_defconfig
+++ b/configs/thunderx_88xx_defconfig
@@ -32,8 +32,8 @@
 # CONFIG_CMD_EDITENV is not set
 # CONFIG_CMD_SAVEENV is not set
 # CONFIG_CMD_ENV_EXISTS is not set
-# CONFIG_CMD_NET is not set
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+# CONFIG_NET is not set
 # CONFIG_MMC is not set
 CONFIG_DM_SERIAL=y
 CONFIG_DEBUG_UART_SKIP_INIT=y