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: Ic19265d4ad3db4eda66a3c27e1e08873a8f2a4d7
(cherry picked from commit 4f782bf0cb69929ebf03de239e2c9bf8e82adf5e)