login: Create /run/camera directory on devices with ARC++ camera HAL v3

On devices with ARC++ camera HAL v3 Chrome needs to host the unix domain
socket /run/camera/camera3.sock to provide Mojo camera service to the
system.

BUG=b:36233258, b:32690003
CQ-DEPEND=CL:487551
TEST=Make sure camera work on poppy.

Change-Id: I32e5b8d6bb5d88210e1bbf8ed8e72516cd58bbe8
Reviewed-on: https://chromium-review.googlesource.com/544741
Commit-Ready: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
1 file changed