also correct elf_machine for mips.

Change-Id: I261d5bf54ec7ac88290141a4b4ec12e203c34155
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2035515
Auto-Submit: Yu Yin <xwafish@gmail.com>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66143}