Expose more functionality from hwtrust

Instead of having parsing code in remote_prov_utils and hwtrust, we
should expose more of the values that are parsed in hwtrust and use
that interface to implement the verification of a CSR.

The aim of this CL is to modify tests in rkp_factory_extraction_lib
to account for the new implementations that live in remote_prov_utils

Test: atest librkp_factory_extraction_test
Change-Id: Ia8160d5e89d3e3702e65b0cf3296d9dcd2c67dbe
1 file changed