Sepolicy: Changes for time-service

1. Define libtime_genoff as same_process_hal_file
Some other libraries which are labeled as same_process_hal_file
depend on libtime_genoff. So define libtime_genoff as
same_process_hal_file.

2. Define time-service properties as vendor prop
Define time-service properties as vendor prop to follow treble
rules.

3. Remove policy for alarm prop as it is not necessary now.

CRs-Fixed: 2209818
Change-Id: If9c28ef166dcb168b6a75bb2e50d8456224c42e4