syscall: use SYS_SETRLIMIT in //sysnb setrlimit1 on linux/arm64

syscall: use SYS_SETRLIMIT in //sysnb setrlimit1 on linux/arm64

Otherwise the setrlimit1 wrapper would be generated using the inexistent
SYS_GETRLIMIT1 syscall number.

This was likely missed in CL 476097.

For #476097

Change-Id: I5cfa2ebacb58aeeaddd3db3639a45cf368fbe0ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/527555
Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>