Revert Fuchsia SDK back to 8901506071232259296

Reason for revert: Reverting to an SDK revision that allows the "chromium" package to be updated to a local build.  The previous SDK revert didn't go back far
enough to fix things.

TBR=sergeyu

Bug: fuchsia:37329
Change-Id: I3accef797ccb4110f8bcacd7f559d6d19d1e4c3f
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/+/1825903Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700038}

build/fuchsia/linux.sdk.sha1

-8901447639518533984
+8901506071232259296
\ No newline at end of file

build/fuchsia/mac.sdk.sha1

-8901448833775125712
+8901506068351790832
\ No newline at end of file