dt-bindings: arm: renesas: Document SMARC EVK

Document Renesas SMARC EVK board which are based on RZ/G2L (R9A07G044)
SoC. The SMARC EVK consists of RZ/G2L SoM module and SMARC carrier board,
the SoM module sits on top of carrier board.
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/20210609153230.6967-4-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/arm/renesas.yaml

@@ -311,6 +311,8 @@ properties:
 
       - description: RZ/G2{L,LC} (R9A07G044)
         items:
+          - enum:
+              - renesas,smarc-evk # SMARC EVK
           - enum:
               - renesas,r9a07g044c1 # Single Cortex-A55 RZ/G2LC
               - renesas,r9a07g044c2 # Dual Cortex-A55 RZ/G2LC