[DEFCONFIG] disable MWIFIEX

Disable the MWIFIEX driver to allow using the new version of the
driver with a recipe in meta-seco-rk that builds the driver as an
out-of-tree module for E09 and C31.

The old, in-tree version of the driver is no longer needed.

arch/arm64/configs/seco_linux_defconfig

@@ -199,9 +199,9 @@ CONFIG_USB_NET_SMSC95XX=y
 CONFIG_USB_NET_QMI_WWAN=y
 CONFIG_BRCMFMAC=m
 CONFIG_SECO_GSM_POWER_MANAGER=m
-CONFIG_MWIFIEX=m
-CONFIG_MWIFIEX_SDIO=m
-CONFIG_MWIFIEX_PCIE=m
+# CONFIG_MWIFIEX is not set
+# CONFIG_MWIFIEX_SDIO is not set
+# CONFIG_MWIFIEX_PCIE is not set
 CONFIG_WL_ROCKCHIP=y
 CONFIG_WIFI_BUILD_MODULE=y
 CONFIG_AP6XXX=m