feat(Legion Go S): Add IMU support

- Adds reading IMU data from MCU interface 5. This device polls at 1000Hz and provides all 3 axis for each interial measurement in a single report.
- While at it, performs cleanup of unused event types and remanes many others to be simpler. The more complex names aren't needed for Go S as it doesn't have as many interfaces as the Go.
- Adds basic support for the touchpad. X/Y events are disabled until a firmware update can enable ABS values instead of REL values.

Author: pastaq

rootfs/usr/share/inputplumber/devices/50-legion_go_s.yaml

@@ -47,23 +47,11 @@ source_devices:
       handler: event*
 
   # IMU
-# Broken for now --causes IP to hard freeze
-# Enabling only gyro_3d allows the tablet gyro to work without needing kernel patch
-# TODO: Find out why this is broken and swap tablet gyro to controller gyro as default.
-#  - group: imu
-#    iio:
-#      name: accel_3d
-#      mount_matrix:
-#        x: [0, 1, 0]
-#        y: [0, 0, -1]
-#        z: [-1, 0, 0]
-#  - group: imu
-#    iio:
-#      name: gyro_3d
-#      mount_matrix:
-#        x: [0, 1, 0]
-#        y: [0, 0, -1]
-#        z: [-1, 0, 0]
+  - group: imu
+    hidraw:
+      vendor_id: 0x1a86
+      product_id: 0xe310
+      interface_num: 5
 
 # Optional configuration for the composite device
 options: