system/security: convert LOCAL_MODULE_PATH to LOCAL_MODULE_RELATIVE_PATH

LOCAL_MODULE_PATH doesn't work for multiarch builds, replace it
with LOCAL_MODULE_RELATIVE_PATH.

Change-Id: I4e4ceec61d026bbe74ba604554c06104bde42e5e
diff --git a/keystore-engine/Android.mk b/keystore-engine/Android.mk
index e7cab53..bd86b6a 100644
--- a/keystore-engine/Android.mk
+++ b/keystore-engine/Android.mk
@@ -20,7 +20,7 @@
 
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/ssl/engines
+LOCAL_MODULE_RELATIVE_PATH := ssl/engines
 
 LOCAL_SRC_FILES := \
 	eng_keystore.cpp \