Revert of tidy up chromeos_setup.sh (patchset #1 id:1 of https://codereview.chromium...

Revert of tidy up chromeos_setup.sh (patchset #1 id:1 of https://codereview.chromium.org/1051253002/)

Reason for revert:
arm_thumb not defined

Original issue's description:
> tidy up chromeos_setup.sh
>
> - remove unused alex
> - streamline Link's config
> - remove misleading Daisy config:
>   1) armv7=1 does nothing.  We meant to type arm_version=7 here.
>   2) arm_neon=1 does nothing unless arm_version == 7.
>   3) arm_thumb=0 is the default when arm_version <= 7.
>   4) skia_arch_width=32 is the default when skia_arch_type=arm.
>
> I'd just fix this to make Daisy arm_version=7 and arm_neon=1 (and
> arm_thumb=1, which I'm going to separately make the default for
> arm_version=7), but there are known color-order bugs with our
> NEON procs that would make Daisy start pushing bad images to
> Gold.  Going to take baby steps here...
>
> BUG=skia:1843
>
> Committed: https://skia.googlesource.com/skia/+/3c2809bc612f4a265770914f860d214c9665dc4a

TBR=borenet@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:1843

Review URL: https://codereview.chromium.org/1059443002