arm64: HWCAP/HWCAP2 aux args support for 32-bit ARM binaries.
This fixes build/run of golang under COMPAT32 emulation.
PR: 256897
Reviewed by: andrew, mmel, manu, jhb, cognet, Robert Clausecker
Tested by: brd, andrew, Robert Clausecker
Relnotes: yes
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D31175
(cherry picked from commit bbe80bff7c3549128bd19862eea7899b3def1d7f)