cros_system_api: Add constants for valid parameters of the SetLEConnectionParameters API.

BUG=chromium:725367
TEST=N/A

Change-Id: Ic50b8c1cf4ab049ac6b058273dbc3a892d77771f
Reviewed-on: https://chromium-review.googlesource.com/516551
Commit-Ready: Tim Song <tengs@chromium.org>
Tested-by: Tim Song <tengs@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
1 file changed