migrate @JavaDebug to @JavaDerive(toString=true)

This will make it easier to add a new sythetic methods in the future.

Bug: 171271915
Test: aidl_unittests / aidl_integration_test
Merged-In: I043c1320821c1821faede60fa8608ff7cc79bd6c
Change-Id: I043c1320821c1821faede60fa8608ff7cc79bd6c
(cherry picked from commit 9034500d0796fd0ba4ab6598af3e477a642451c4)
10 files changed