has_client: Fix unit tests

This patch allows to use osi_property_set_bool correctly
for the test purposes.
Since  stub/osi.cc stubs also alarm_new/free, has unit tests
will make use of it.

This is patch is needed for the new testcase in following patch
Bug: 262309077
Test: atest bluetooth_has_test
Test: atest BluetoothInstrumentationTests
Tag: #feature

Change-Id: I79037935730b47dbb463fd5614f4e878d226e88b