qcacld-3.0: Enable MOBILE_ROUTER feature on SDXPRAIRIE

Enable MOBILE_ROUTER feature flag on SDXPRAIRIE, which is
a MDM platform.

Change-Id: I039b56b639cd5afb13fba23f4463dc9979c82412
CRs-Fixed: 2359660

configs/default_defconfig

@@ -75,6 +75,10 @@ ifeq ($(CONFIG_ARCH_SDX20), y)
 CONFIG_MOBILE_ROUTER := y
 endif
 
+ifeq ($(CONFIG_ARCH_SDXPRAIRIE), y)
+CONFIG_MOBILE_ROUTER := y
+endif
+
 ifeq ($(CONFIG_ARCH_MSM8917), y)
 	ifeq ($(CONFIG_ROME_IF), sdio)
 		CONFIG_WLAN_SYNC_TSF_PLUS := y