Mark libbinder and libdumpstateutil 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
Merged-In: Ib1d9469ad0aead4cbec7c2548438d44608f36819
(cherry picked from commit b367ff4fd9e332d8ff4bd45bf54778851f06f941)

Change-Id: Ibc2726e1e1c98c8787fea41c1b01d07ea6a0a488
diff --git a/cmds/dumpstate/Android.bp b/cmds/dumpstate/Android.bp
index 5984093..f908cbf 100644
--- a/cmds/dumpstate/Android.bp
+++ b/cmds/dumpstate/Android.bp
@@ -42,6 +42,9 @@
     name: "libdumpstateutil",
     defaults: ["dumpstate_defaults"],
     vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
     header_libs: ["dumpstate_headers"],
     export_header_lib_headers: ["dumpstate_headers"],
     srcs: [