Add keylayout for HORIPAD for Nintendo Switch

This is a third-party USB game controller for the Nintendo Switch, but
doesn't require the special driver needed for the official controllers.

The same button layout is used as for the Nintendo Switch Pro Controller.

Test: manual test with Gamepad Tester app
Change-Id: Ie424bbe8fe40853b5c8683d6094e2c6d3cf55a5b