Cdm to expose GetDeviceInformation() and GetDeviceSignedCsrPayload()

[ Merge of https://widevine-internal-review.googlesource.com/c/cdm/+/178890/ ]

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
Change-Id: I5f7aed8b3471ea477b79d08b95e1d217dc39070b

libwvdrmengine/src/WVDrmFactory.cpp

@@ -325,6 +325,7 @@ void WVDrmFactory::printCdmProperties(int fd) {
       // Debug properties.  Not exposed to app.
       {"boot_certificate_chain",
        wvcdm::QUERY_KEY_DEBUG_BOOT_CERTIFICATE_CHAIN},
+      {"device_information", wvcdm::QUERY_KEY_DEVICE_INFORMATION},
   };
 
   string value;