Replace HashSet with ArraySet in RaParams

ArraySet is designed to be more memory afficient than HashSet. It is
suitable to store small numbers of items.

Test: atest TetheringPrivilegedTests TetheringIntegrationTests \
      TetheringTests
Bug: 261923493
Change-Id: I2bd2eded801cc05ce53ef9f9486b13faf1772d22
3 files changed