Revert Fuchsia SDK back to 890142012436

Reason for revert: Reverting to an SDK revision that allows the "chromium" package to be updated to a local build.

TBR=sergeyu

Bug: fuchsia:37329
Change-Id: I78c88dd4e37a69ad0bac9dd8c4974b95882e1a5b
Cq-Include-Trybots: luci.chromium.try:fuchsia-arm64-cast;luci.chromium.try:fuchsia-x64-cast
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824649Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699669}

build/fuchsia/linux.sdk.sha1

-8901391751860333728
\ No newline at end of file
+8901447639518533984

build/fuchsia/mac.sdk.sha1

-8901393593484977040
\ No newline at end of file
+8901448833775125712