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This CL grows Fuchsia blobstore by a specified amount, large enough to
accommodate packaged executables installed at machine (QEMU) runtime.

Roll SDK from 32a56ad5 to de50ae25 for "fvm extend" and the inclusion
of fvm.blk.

Bug: 798851, 707030
Change-Id: I5a6b6be21cc443e6ad46271918a2f40e191a26f6
Reviewed-on: https://chromium-review.googlesource.com/987012
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547568}