Mark libmemtrack as VNDK in Android.bp

As a VNDK module, Android.bp must have 'vndk' tag as well as
'vendor_available: true'.

The 'vndk' tag for VNDK module is formated as below:
vndk: {
    enabled: true,
},

VNDK modules will be installed both in system/lib(64) as normal and
in system/lib(64)/vndk as a vendor variant.

Bug: 63866913
Test: build and boot with BOARD_VNDK_VERSION=current
Change-Id: I4b9e560ca6d4751889a7b14f205e678b68c20008
1 file changed
tree: b2e54f56c743815a92162edf612b17d11764e01f
  1. Android.bp
  2. include/
  3. memtrack.cpp
  4. memtrack_test.c