configs: mscc_ocelot: add network support

Now that network support is added for the ocelot platform, let's add it
in the default configuration.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
diff --git a/configs/mscc_ocelot_defconfig b/configs/mscc_ocelot_defconfig
index cbdc76d..edc476d 100644
--- a/configs/mscc_ocelot_defconfig
+++ b/configs/mscc_ocelot_defconfig
@@ -60,6 +60,7 @@
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_SPI_FLASH_MTD=y
 CONFIG_DM_ETH=y
+CONFIG_MSCC_OCELOT_SWITCH=y
 CONFIG_PINCTRL=y
 CONFIG_PINCONF=y
 CONFIG_DM_SERIAL=y