Add real GEEK for RKP factory enrollment

Include a unit test to verify the GEEK cert chain is valid.

Test: libkeymint_remote_prov_support_test
Bug: 191301285
Change-Id: Icf9cfa165fbccb24b36b03ff3ce729a7e9c44cfd
Merged-In: Icf9cfa165fbccb24b36b03ff3ce729a7e9c44cfd