qcacld-3.0: Override WLAN_PROFILE to default only if it is unset

Currently WLAN_PROFILE is overridden to default in all cases.
In many targets, defconfig other than default_defconfig needs
to be picked, so set WLAN_PROFILE to default only if it is not
set before.

Change-Id: Ia9a5ad7c9eedd56be59418371867107258e65ea0
CRs-Fixed: 2818090
diff --git a/Android.mk b/Android.mk
index a7dc5ed..5dfb078 100644
--- a/Android.mk
+++ b/Android.mk
@@ -68,7 +68,9 @@
 
 else # Multi-ok check
 
+ifeq ($(WLAN_PROFILE),)
 WLAN_PROFILE := default
+endif
 
 ifeq ($(LOCAL_DEV_NAME), qcacld-3.0)