Add MS Surface Precision Mouse to mttools platform

In order to add a validation test to a change to mouse scrolling, add
that mouse (Microsoft Surface Precision mouse) to the known platforms
in mttools.

BUG=b:149932225
TEST=Ensure all current and new touchtests pass (src/platform/touchpad-tests)

Change-Id: I9e0b1bc9a286aad724ee0fbac80ed13c2c0fa8d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mttools/+/2195473
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Reviewed-by: Jora Jacobi <jora@google.com>
Tested-by: Jora Jacobi <jora@google.com>
Commit-Queue: Jora Jacobi <jora@google.com>
2 files changed