This reverts commit 611e4127.

Reason for revert: https://crbug.com/1080367

Original change's description:
> [Intl] Use new getDefaultHourCycle to replace old hack
> 
> Use the ICU 67.1 new API DateTimePatternGenerator::getDefaultHourCycle
> to replace a hack which get the pattern of "jjmm" to find out the
> default hour cycle of a locale
> Bump the required API version from 65 to 67
> 
> Bug: v8:10225
> Change-Id: I3378edacb6dfb8400357ac0bf3d5d50b9fe008bd
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2173875
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Frank Tang <ftang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67549}

TBR=jkummerow@chromium.org,ftang@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:10225
Change-Id: I8bdfbdfc6c906814e5a7525cbde79c9cac854bd1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2208811Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67929}