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OutputPresenterFuchsia was setting image constraints for allocated
buffers. As result the images were always allocated with
pixel_format=R8G8B8A8 without any flags set in format_modifiers. As
result, device-specific optimizations were not enabled for these
buffers, so GPU was using more memory bandwidth than would be possible
otherwise. This change updates OutputPresenterFuchsia to avoid setting
any constraints for the buffer collection. Instead buffer collection
constraints are set only through Vulkan. This ensures that the buffers
are allocated with all possible optimizations supported by the Vulkan
driver.

Bug: 1128740
Change-Id: I7ec8f605ace86a33062d5296a1b6b2e1f647b3c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414757Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808101}