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This change implements the resolution of LWG3255 in base::span.
Following this change base::span allows conversions from std::array that
add const or volatile qualifications.

References:
- https://cplusplus.github.io/LWG/issue3255
- https://github.com/cplusplus/draft/commit/2ae381

Bug: 828324
Change-Id: Ib58e769b841f58778a547109f654cceda3a75cd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087720
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747218}