keystore2 compat: stop crashing without hwservicemanager

New devices will no longer have hwservicemanager installed as part of
HIDL deprecation. So this service must not crash when it's not found.
From keystore2's perspective, this is the same as not having the HIDL
Keymaster HALs installed.

Test: remove hwservicemanager from
device/google/cuttlefish/shared/device.mk && launch_cvd
Bug: 298454031

Change-Id: I4c7cefd388936aff821cff572a8af1b6f69f82d1
1 file changed