Mark libprocinfo vendor_avaialable.

libprocinfo belongs to vndk-cap. Mark it vendor_available to enable vndk
abi stability checks on it.

Details: https://android-review.googlesource.com/368372

Test: mm -j64

Bug: 38244611

Merged-In: I05212410225d4cdb0cfa9abbd8b81071c79667db
Change-Id: Ib79c7e3bdde1c7d3cd9f2bb95c284b4690a22ebb
(cherry picked from commit 4362e5b0f800c9aa5e11ed1e449dbe173a617a4d)
diff --git a/libprocinfo/Android.bp b/libprocinfo/Android.bp
index c13ffe9..aedaa38 100644
--- a/libprocinfo/Android.bp
+++ b/libprocinfo/Android.bp
@@ -22,6 +22,7 @@
 
 cc_library {
     name: "libprocinfo",
+    vendor_available: true,
     host_supported: true,
     srcs: [
         "process.cpp",