cmd/internal/obj/arm64: only emit R_CALLIND relocations on calls

Don't emit it for jumps. In particular, not for the return
instruction, which is JMP (LR).

Reduce some binary size and linker resources.

Change-Id: Idb3242b86c5a137597fb8accb8aadfe0244c14cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/260341


Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>