Fix-build : Do not build bluedroid for 64 bit targets.

This code is not 64 bit safe. In particular, it attempts
to cast pointer types to UINT32 in several places. For now,
build it as a 32 bit library. A 64 bit variant will not be
needed if libbluetooth_jni is also build for 32 bit only.

Change-Id: Ic5f86bd2823083cacf21a852d1c13b4796a7e125
diff --git a/gki/Android.mk b/gki/Android.mk
index 116664b..2e8ef56 100644
--- a/gki/Android.mk
+++ b/gki/Android.mk
@@ -27,5 +27,6 @@
 LOCAL_MODULE_TAGS := optional
 LOCAL_SHARED_LIBRARIES := libcutils libc
 LOCAL_MODULE_CLASS := STATIC_LIBRARIES
+LOCAL_MULTILIB := 32
 
 include $(BUILD_STATIC_LIBRARY)