Add kernel and userland support for Zen6 IBS extensions per AMD pub
69205 (rev 1.00, March 2026): alternate fetch/op disable via ctl2[0],
fetch latency filtering, virtual address bit 63 filtering, and
streaming-store filtering. Decode the new IbsOpData2 StrmSt and
RmtSocket bits. Update libpmc, pmcstat and manpage.
Pre-Zen6 systems work unchanged with ibs_ctl2 == 0.
Sponsored by: AMD
Signed-off-by: Andre Silva <andasilv@amd.com>