Mark libziparchive 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: Iec5d3496e91a99f3e6b0c816c67ad279672ff36a

libziparchive/Android.bp

@@ -58,6 +58,9 @@ cc_library {
     name: "libziparchive",
     host_supported: true,
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
 
     defaults: [
         "libziparchive_defaults",