KeyMint VTS: allow for stricter SharedSecret impls

Bug: 192223752
Test: VtsAidlSharedSecretTargetTest
Merged-Ind: Iccf2d0fe2a2d10ad12269dfecf78ea1d831c3ad4
Change-Id: Iccf2d0fe2a2d10ad12269dfecf78ea1d831c3ad4
Ignore-AOSP-First: already merged in aosp/master
1 file changed