Rename KM VM related system properties

To organize it under trusty and distinguish it from
Widevine VM.

Bug: 368502791
Test: launch_cvd --secure_hals=guest_keymint_trusty_insecure
Test: atest VtsAidlSharedSecretTargetTest
Change-Id: I48e43b9709e59b1cb9e1ba9113d5ef894469f485
2 files changed