Remove unused isTrunkStableFeatureEnabled from NsdService Dependencies

Currently reading trunk stable flag from mainline module is not
supported and aosp/2954910 removes util methods to read trunk stable
flag.
This CL removes unused isTrunkStableFeatureEnabled in Dependencies.

Test: TH
Change-Id: I3fca329a73c2e249cf48cd01700d719b5f46dbc2
1 file changed