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Changes the OUTDIR/bin/install_foo scripts to run "pm install"
on existing Fuchsia Amber repositories. This better suits the common
workflow of deploying to existing paved devices.

Adds a GN arg "default_fuchsia_build_dir_for_installation" to enable
super EZ zero-arg invocations of the install script.

Bug: 973159
Change-Id: I5d4456fd74f7000a576749d2c427051f24d216b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815838Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Auto-Submit: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703075}