libprotobuf-c-nano: vendor_available

Required for librilutils

Test: build with BOARD_VNDK_VERSION=current
Bug: 37429672
Change-Id: I05fa0c12fc8370b6aabdd7e9d95b33a73459319d
diff --git a/Android.bp b/Android.bp
index ba28c08..29722c4 100644
--- a/Android.bp
+++ b/Android.bp
@@ -30,11 +30,13 @@
 
 cc_library_static {
     name: "libprotobuf-c-nano",
+    vendor_available: true,
     defaults: ["libprotobuf-c-nano-defaults"],
 }
 
 cc_library_static {
     name: "libprotobuf-c-nano-enable_malloc",
+    vendor_available: true,
     defaults: ["libprotobuf-c-nano-defaults"],
 
     cflags: ["-DPB_ENABLE_MALLOC"],