fix inputs/outputs of generate_fontconfig_caches

generate_fontconfig_caches uses ./etc/fonts/fonts.conf
and produces ./fontconfig_caches/CACHEDIR.TAG

Add them as inputs/outputs.

Re-enable remote for genereate_fontconfig_caches.

Bug: 378515831
Change-Id: I7a17e6afb28e16e36fd50b5cd37d739d75116878
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6012014
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Fumitoshi Ukai <ukai@google.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Fumitoshi Ukai <ukai@google.com>
Cr-Commit-Position: refs/heads/main@{#1381560}
NOKEYCHECK=True
GitOrigin-RevId: d11517ae3c6abe9454bf9cbe3becfcf56ccb76da