Merge of https://widevine-internal-review.googlesource.com/c/cdm/+/169024
The CSR extracted by WV internal BCC extraction tool is missing a
field "unverifiedDeviceInfo". This is required by the RKP's device
uploading tool for the CSR to be accepted.
Also updated the size of the randomly generated challenge from 32 bytes
to 64 bytes, same as what is used by rpk_factory_extraction_tool.
Test: extracted CSR v2 and v3 and dry run uploading
Bug: 275075496
Change-Id: Icc776f810c81ac6589d82935950167925f95f906
6db1ae5167