Kyria left/right overlays, matrix transform fixes

* Refactor Kyria into separate left/right "revisions"
  of the Kyria shield, and include central
  kyria.dtsi file with common definition.
* Fixes for keymaps to work fully with matrix
  transforms that override effective rows/columns.
* Add ability for matrix transform to do row/col
  offsets, which is needed for split keyboards.

app/dts/bindings/zmk,matrix-transform.yaml

@@ -4,6 +4,15 @@ description: |
 compatible: "zmk,matrix-transform"
 
 properties:
+  columns:
+    type: int
+    required: true
+  rows:
+    type: int
+    required: true
+  col-offset:
+    type: int
+    default: 0
   map:
     type: array
     required: true