aboot: mdtp: use boot_verifier for boot/recovery verification

The boot and recovery images are signed by existing mechanism
in LK. Reuse this mechanism for MDTP verification of these images.

In case that boot or recovery images were verified in aboot, take
the verification result. Otherwise, for example, if device was
previously OEM unlocked, call boot_verifier APIs to verify the
images internally in MDTP module.

Change-Id: I87825fa3cee007468ca9676475d76914fccdbe36
3 files changed