Move libion from system/core to system/memory

system/core/libion is being movet into system/memory/libion. Adjust include
path.

Bug: 141634854
Change-Id: Icecd0c82eb56a5550936bb301425fb863b1b0fb0
diff --git a/gralloc/Android.mk b/gralloc/Android.mk
index 7b3659e..761113b 100644
--- a/gralloc/Android.mk
+++ b/gralloc/Android.mk
@@ -54,8 +54,8 @@
 LOCAL_VENDOR_MODULE           := true
 LOCAL_MODULE_TAGS             := optional
 LOCAL_C_INCLUDES              := $(common_includes) \
-                                 system/core/libion/include \
-                                 system/core/libion/kernel-headers \
+                                 system/memory/libion/include \
+                                 system/memory/libion/kernel-headers \
                                  $(kernel_includes)
 
 LOCAL_HEADER_LIBRARIES        := display_headers