selftests/seccomp: add sparc64 support

sparc64 now selects HAVE_ARCH_SECCOMP_FILTER, so teach seccomp_bpf
how to read and write its registers: the syscall number lives in %g1
and the return value in %o0.  The NT_PRSTATUS regset appends the
register window read back from the tracee's stack and has no exported
layout, so use the sparc-specific PTRACE_GETREGS64/PTRACE_SETREGS64
requests instead, which transfer the uapi struct pt_regs directly.

Errors are signaled by the carry bit in tstate with a positive errno
value in %o0, so provide a SYSCALL_RET_SET that maintains both, and
mark the arch SYSCALL_RET_SET_ON_PTRACE_EXIT since a return value
poked at entry would be overwritten by the syscall skip path, as on
powerpc.

Passes 95 of 95 on an UltraSPARC T4-1 (16 skipped for missing
optional features such as uprobes).

Link: https://github.com/sparclinux/issues/issues/11
Signed-off-by: Stian Halseth <stian@itx.no>
Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Link: https://lore.kernel.org/r/20260902072745.3412940-3-stian@itx.no
Signed-off-by: Andreas Larsson <andreas@gaisler.com>

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