Adds a debug(...) method to IBase, the base class for all Treble interfaces

The default implementation does nothing but this allows implementations to
emit diagnostics to a given file handle in a unified fashion.

Bug: 33961528
Test: hidl_test, hidl_test_java
Change-Id: I6e2ca9a53e745f38bee75950edbb4fa6b5149e52
1 file changed