Remove qtaguid support on devices with bpf

For new devices that is using bpf for socket tagging/untagging, it is
no longer  necessary to keep a reference of tagged socket stats in
xt_qtaguid module as well since the API for these detail per socket
stats is ready and apps should not read the proc file for it.

Test: run vts -m vtsKernelQtaguidTest
Bug: 30950746
Change-Id: Ibbd060dca023c7a5d5a1eb955242aabda1014fd0