dt-bindings: arm: renesas: Document Renesas RZ/G2{L,LC} SoC variants

Add device tree bindings documentation for Renesas RZ/G2{L,LC}
SoC variants.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Chris Paterson <Chris.Paterson2@renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210609153230.6967-3-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/arm/renesas.yaml

@@ -309,6 +309,15 @@ properties:
               - renesas,r9a07g043u12 # RZ/G2UL Type-2
           - const: renesas,r9a07g043
 
+      - description: RZ/G2{L,LC} (R9A07G044)
+        items:
+          - enum:
+              - renesas,r9a07g044c1 # Single Cortex-A55 RZ/G2LC
+              - renesas,r9a07g044c2 # Dual Cortex-A55 RZ/G2LC
+              - renesas,r9a07g044l1 # Single Cortex-A55 RZ/G2L
+              - renesas,r9a07g044l2 # Dual Cortex-A55 RZ/G2L
+          - const: renesas,r9a07g044
+
 additionalProperties: true
 
 ...