qcacld-3.0: Enable CONFIG_WLAN_STREAMFS for CFR

Set CONFIG_WLAN_STREAMFS depend on CONFIG_RELAY,
which can support write CFR data to the node:
/sys/kernel/debug/xxx/cfrwlan/cfr_dump0

Change-Id: I2a9b1920c55ca16277282d5430ad3f3de5c4795d
CRs-Fixed: 2902315

configs/qca6390_defconfig

@@ -368,6 +368,9 @@ ifeq ($(CONFIG_DEBUG_FS), y)
        CONFIG_WLAN_DEBUGFS := y
 
        CONFIG_WLAN_POWER_DEBUGFS := y
+ifeq ($(CONFIG_RELAY), y)
+       CONFIG_WLAN_STREAMFS := y
+endif
 endif
 
 # Feature flags which are not (currently) configurable via Kconfig