Mark libcarpowermanager as vendor_available

libcarpowermanager can be used by vendor module.
Mark libcarpowermanager as vendor_available.

Bug: 139171860
Test: Compile and boot successfully
Change-Id: Ie042fe9ad2b441f6f841b22af5f2ef1bebec62a0

Change-Id: I8cccae9bc83c638e650f50d016aae220f50acf0d
diff --git a/car-lib/Android.bp b/car-lib/Android.bp
index d3da6da..04699cf 100644
--- a/car-lib/Android.bp
+++ b/car-lib/Android.bp
@@ -24,6 +24,7 @@
 
 cc_library {
     name: "libcarpowermanager",
+    vendor_available: true,
 
     aidl: {
         export_aidl_headers: true,