Add key layouts for SteelSeries Stratus+

The Stratus+ is somehow bugged when it uses the generic gamepad file; to
fix this, a Stratus+-specific key layout file is added, similar to the
one for the Stratus Duo.

Bug: b/232827632
Test: Stratus+ USB connection, playing SF4 on eve (ARC-R)
Change-Id: Ied0e27a57b159fd35915634bd62ffced58ced4f2

data/keyboards/Vendor_1038_Product_1434.kl

@@ -0,0 +1,58 @@
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# SteelSeries Stratus+
+# Autogenerated based on Vendor_045e_Product_02ea.kl (XBox One Controller - Model 1708)
+#
+
+# Mapping according to https://developer.android.com/training/game-controllers/controller-input.html
+
+key 304   BUTTON_A
+key 305   BUTTON_B
+key 307   BUTTON_X
+key 308   BUTTON_Y
+
+key 310   BUTTON_L1
+key 311   BUTTON_R1
+
+# Triggers.
+axis 0x02 LTRIGGER
+axis 0x05 RTRIGGER
+
+# Left and right stick.
+# The reported value for flat is 128 out of a range from -32767 to 32768, which is absurd.
+# This confuses applications that rely on the flat value because the joystick actually
+# settles in a flat range of +/- 4096 or so.
+axis 0x00 X flat 4096
+axis 0x01 Y flat 4096
+axis 0x03 Z flat 4096
+axis 0x04 RZ flat 4096
+
+key 317   BUTTON_THUMBL
+key 318   BUTTON_THUMBR
+
+# Hat.
+axis 0x10 HAT_X
+axis 0x11 HAT_Y
+
+
+# Mapping according to https://www.kernel.org/doc/Documentation/input/gamepad.txt
+# Two overlapping rectangles
+key 314   BUTTON_SELECT
+# Hamburger - 3 parallel lines
+key 315   BUTTON_START
+
+# Xbox key
+key 316   BUTTON_MODE