Mark the module as VNDK or VNDK-SP in Android.bp

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

For a VNDK module, the 'vndk' tag has 'enabled: true'.
It will be installed system/lib(64)/vndk as a vendor variant.

For a VNDK-SP module, the 'vndk' tag has
'support_system_process: true' as well as 'enabled: true'.
It will be installed system/lib(64)/vndk-sp as a vendor variant.

Bug: 63866913
Test: build and boot with BOARD_VNDK_VERSION=current
Merged-In: I383af9ccc5457afe437c0cd910c11b636e4b6dd5
Change-Id: I383af9ccc5457afe437c0cd910c11b636e4b6dd5
(cherry picked from commit 8d9fa07fe1d5d160e6514e7ecf55157f69b091d8)
diff --git a/Android.bp b/Android.bp
index 33a096b..7ae27e8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -35,6 +35,10 @@
     export_header_lib_headers: ["libhardware_headers"],
 
     vendor_available: true,
+    vndk: {
+        enabled: true,
+        support_system_process: true,
+    },
 }
 
 subdirs = [