Use Java code path for bpf map operations in BpfNetMaps

Experiment to verify bpf map operations refactoring showed no
change of map size metrics and no system health regressions.
So this CL update BpfNetMaps to always use new code path with kill
switch.

Test: m
Bug: 217624062
Change-Id: Ic17470ac5c075884871ea2df2c13c054f5ac2929