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Fuchsia's SDK FVM file now includes its own minfs partition which
collides with the minfs partition that we create in our runner scripts.
We relied on the partition to supply client public keys to sshd on the
device.

This change adds the keys directly to the Zircon boot image at runtime
and boots using the modified image.

Rolls SDK to 9853d7bcb5f3944a9f3e599dbd4ec6ee1ce95852.

Bug: 902908
Change-Id: I5bb15756039d1b3b58a4f3989b13a5b88496d1fd
Reviewed-on: https://chromium-review.googlesource.com/c/1324234
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606302}