Remove path from hidl_package_root.

This now defaults to the current path making references
to it relocatable.

Bug: 111366989
Test: make hidl interfaces under this package root
    (this exercises the new path)

Change-Id: I548667c1c54e7e4989c5eaecee9baeedc3fae496
diff --git a/transport/Android.bp b/transport/Android.bp
index 92fbc94..ea9b38e 100644
--- a/transport/Android.bp
+++ b/transport/Android.bp
@@ -14,7 +14,6 @@
 
 hidl_package_root {
     name: "android.hidl",
-    path: "system/libhidl/transport",
 }
 
 cc_library {