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This removes the code for unmounting the FUSEs (filesystem in userspace)
on suspend. Instead of unmounting to resolve the FUSE/freeze on suspend
race condition, we will be using powerd code that orders freeze using
freezer cgroups.

Crostini still has some work left to do before this can be done for it,
so unmount on suspend for its FUSE, sshfs, will be done in a later
patch.

Test: "suspend_stress_test -c 2500" on device
Bug: b/134792837
Change-Id: Icb8f9e309f6780e6f935be550c6c4e048a44b1fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336869
Commit-Queue: Derek Basehore <dbasehore@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: David Munro <davidmunro@google.com>
Cr-Commit-Position: refs/heads/master@{#811950}