Enhancement for OnInfo callback on DRM Framework

In DRM framework, plugins can transmit DrmInfoEvent to Java layer.
Although DrmInfoEvent has several entries, current implementation
can only convey integer and String. This change enables plugins
uto propagate a hashmap to Java layer. The hashmap can have
one or more Strings and one byte array as value.

Changes are made by Sony Corporation.

bug: 10459159

Change-Id: I5f2bfb43b676863ef4d220fd4ef1e48777e92752
(cherry picked from commit 84a5b5cab40711e20ba70c5ed4dfeab6b558b53b)