Add parceling support for HIDL memory in Java

This change adds support for reading/writing a HidlMemory
instance into / out of a HwParcel and HwBlob, in a format that
is compatible with the hidl_memory C++ type.
This paves the way to be able to exchange shared memory blocks
between native and Java via HwBinder, which will be exposed
as adding Java support for the HIDL 'memory' type.

Change-Id: I6cbbf852218c8a631f9014e7caa7a97d17e11889
Bug: 143566068