devices: fs: Enable posix_acl support
devices: fs: Enable posix_acl support

Advertise that we support posix acls in the response to the init
message.  Since the VM does access checks before sending the request to
the server, having this disabled meant that the VM was rejecting
requests that should have been allowed to succeed.

BUG=b:159285544
TEST=touch test
     setfacl -m u:crosvm:rw test
     su -s /bin/bash -c 'echo hello > test' crosvm
     cat test # check that it contains "hello"

Change-Id: I047b590e4caf0f2883b3f6198b9bc071e9e40a93
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2253494
Reviewed-by: Stephen Barber <7719587e4b5a49340661b214ec85602f3918d06f@chromium.org>
Commit-Queue: Chirantan Ekbote <35787c0e27de5c48735e07f8324823b765e8bcbc@chromium.org>
Tested-by: Chirantan Ekbote <35787c0e27de5c48735e07f8324823b765e8bcbc@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm