[fuchsia] Remove qemu.arm64 from default checkout_fuchsia_boot_images

Bug: 1243442
Change-Id: Ife89fa8f7182deac4ad09529f3a18c72502809f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3119222


Reviewed-by: Chong Gu <chonggu@google.com>
Commit-Queue: Chong Gu <chonggu@google.com>
Cr-Commit-Position: refs/heads/main@{#915909}