volley: fix build

TargetApi is not available until SDK 17

Change-Id: Iaafe38eb92f337de96512888699ce697099c78cc
diff --git a/Android.mk b/Android.mk
index c646b6d..a4375e7 100644
--- a/Android.mk
+++ b/Android.mk
@@ -19,7 +19,7 @@
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := volley
-LOCAL_SDK_VERSION := 14
+LOCAL_SDK_VERSION := 17
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
 include $(BUILD_STATIC_JAVA_LIBRARY)