keystore-engine: Restore module path

The module relative path was accidentally erased when BoringSSL
compatibility was added. This restores the path so that WiFi with
keystore-backed credentials works again (among other things).

Bug: 19680487
Change-Id: Iee7c13d7b60d93f1520886e90ec23875bd52ab9a
diff --git a/keystore-engine/Android.mk b/keystore-engine/Android.mk
index e409952..1f5d903 100644
--- a/keystore-engine/Android.mk
+++ b/keystore-engine/Android.mk
@@ -30,6 +30,8 @@
 else
   LOCAL_MODULE := libkeystore
 
+  LOCAL_MODULE_RELATIVE_PATH := ssl/engines
+
   LOCAL_SRC_FILES := \
 	eng_keystore.cpp \
 	keyhandle.cpp \