[ Cherry-pick of http://go/wvgerrit/212250 ]
Certain OEMCrypto implementations are returning build info with
trailing C-string null bytes; others are returning all null bytes.
This change attempts to trim any trailing zeros. For build info
with a single trailing zero, this should fix the format; for those
containing all zeros, this will indicate a failure on OEMCrypto's part
for returning all zeros. The CDM will not prevent request generation,
but will omit the result in the ClientIdentification. The server
will decide whether to provide a response or not.
Bug: 348497732
Bug: 348498112
Bug: 366819137
Change-Id: I281ab14e0e46116825321a7965d971b9d68c49fc
(cherry picked from commit 7c81f7bed4fec8199f7fbdb5e95452eacdf3b3c7)
04a70543ea