configs: gwventana_emmc_defconfig: add MV88E61XX DSA switch support

The MV88E61XX switch is used on the GW5904 which is an eMMC based board.
Adding it here allows us to remove the gwventana_gw5904_defconfig.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/configs/gwventana_emmc_defconfig b/configs/gwventana_emmc_defconfig
index 032dcfe..ee833a5 100644
--- a/configs/gwventana_emmc_defconfig
+++ b/configs/gwventana_emmc_defconfig
@@ -114,9 +114,12 @@
 CONFIG_FSL_USDHC=y
 CONFIG_MTD=y
 CONFIG_PHYLIB=y
+CONFIG_PHY_FIXED=y
 CONFIG_DM_MDIO=y
+CONFIG_DM_DSA=y
 CONFIG_E1000=y
 CONFIG_FEC_MXC=y
+CONFIG_MV88E6XXX=y
 CONFIG_MII=y
 CONFIG_PCI=y
 CONFIG_PCIE_IMX=y