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This change creates a new target containing only VROrientationDevice.
This will allow embedders (and content) to link against just the only
VROrientation device so that it doesn't need to link in all of device/vr
if that's the only device that it wants/needs.

Future work can create components for each device, such that including
AR, GVR, or each of the immersive (windows) runtimes can be done
independent of each other.

Bug: 1070807
Change-Id: I12c8ec78a60e876d820cac881354a088b9843d73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154399
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761164}