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: I0d9dd1ebb00fcf514e374682497b8d26d0bfa353
diff --git a/Android.bp b/Android.bp
index c7714c1..05ca928 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,6 +1,5 @@
 hidl_package_root {
     name: "android.hardware",
-    path: "hardware/interfaces",
 }
 
 cc_defaults {