Cleanup QCOM usage of LOCAL_MODULE_TAGS

Starting from GB, modules which doesn't have LOCAL_MODULE_TAGS
defined (default to user tag) or which has user tag and not part
of GRANDFATHERED_USER_MODULES does throgh ERROR/WARNING
message. To supress these WARNING messages, we need to add
optional tag.

Targets tested on:
msm8660_surf

Tests:
Did a build from scratch

Change-Id: I006ae23366cf1f517f0c68f66f607be1455b4ba9

softap/jni/Android.mk

@@ -9,6 +9,8 @@ LOCAL_SRC_FILES := QWiFiSoftApCfg.c
 
 LOCAL_MODULE := libQWiFiSoftApCfg
 
+LOCAL_MODULE_TAGS := optional
+
 LOCAL_C_INCLUDES := $(KERNEL_HEADERS) \
                     $(JNI_H_INCLUDE)