GetDeviceInformation() and GetDeviceSignedCsrPayload() are added to
cdm_engine and crypto_session, so that they can be queried by DRM
plugin. This is to allow the wv drm HAL to be able to extract BCC and
CSR payload to build CSR for prov 4 device registration, such that we
don't need a separate RKP HAL to do this job.
Changes to the DRM plugin to use the exposed methods will be in the
coming CL.
Bug: 286556950
Test: request_license_test
Merged from https://widevine-internal-review.googlesource.com/178890
Merged from https://widevine-internal-review.googlesource.com/179730
Change-Id: Ibafa3a58c99fbb8f1f25f8951d3749110bd32176