ContextHubService: Hack in Google vendor value

To workaround b/30808791 without changing the NanoApp API,
we make the assumption that if the most significant byte
of our four-byte app ID is a lower-case 'L', then this
is a Google Nanoapp and thus we should use "Googl" for
our vendor ID, and set the most significant four bytes
of our eight byte app ID accordingly.

Bug: 30922112
Change-Id: I155dff58cdda1ef36a68e6d25df1e9059b1252f1