Add Android T GKI 'boot/init_boot' verification scheme

Initial support for verifying 'generic_kernel' and 'generic_ramdisk'
Android T GKI descriptors.

Bug: 211741246
Test: Mock out GetBlockDevicePath() and vintf info, and then
  $ atest vts_gki_compliance_test
Change-Id: Ic4c13ac52b80c4b6db3b03e384ef7dce5a46b4dc
1 file changed