qcacld-3.0: Enable mobile router for SA515M in default config

In kernel 5.4, the arch name for sa515m is CONFIG_ARCH_SA515M, enable
mobile router for this arch in the default defconfig file. The
qca6490 uses the default defconfig, to support qca6490 in sa515m, this
change is required.

Change-Id: I1a26762f8453ea8028c626938599c1f7ddfd3ed4
CRs-Fixed: 3255024

configs/default_defconfig

@@ -266,7 +266,7 @@ ifeq ($(CONFIG_ARCH_SDX20), y)
 CONFIG_MOBILE_ROUTER := y
 endif
 
-ifeq (y, $(filter y, $(CONFIG_ARCH_SDXPRAIRIE) $(CONFIG_ARCH_SA515) $(CONFIG_ARCH_SDXPOORWILLS)))
+ifeq (y, $(filter y, $(CONFIG_ARCH_SDXPRAIRIE) $(CONFIG_ARCH_SA515) $(CONFIG_ARCH_SA515M) $(CONFIG_ARCH_SDXPOORWILLS)))
 CONFIG_MOBILE_ROUTER := y
 endif