Better CoD logging for tracking it's corruption

It looks like CoD (dev_class) value is being corrupted at time when we
receive "User Confirmation Request". This patch adds extra logging of
this value, hopefully next time CoD corruption is reported we would be
able to further pin point it's source.

Once the source of corruption is found, those logs can be safely
deleted.

Test: m -j32; observe logs for "CoD:"
Bug: 328677864
Bug: 347795501
Flag: exempt, log only change
Change-Id: I9789307ef0ad18b052708a8010266423982e82a1