dt-bindings: timer: renesas,tmu: Add R-Car Gen2 support

Document support for the Timer Unit (TMU) on R-Car Gen2 SoCs.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Reviewed-by: Niklas Söderlund <[e-mail]>
Reviewed-by: Wolfram Sang <[e-mail]>
Link: https://lore.kernel.org/r/de215[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>

Documentation/devicetree/bindings/timer/renesas,tmu.yaml

···
           - renesas,tmu-r8a774e1 # RZ/G2H
           - renesas,tmu-r8a7778  # R-Car M1A
           - renesas,tmu-r8a7779  # R-Car H1
+          - renesas,tmu-r8a7790  # R-Car H2
+          - renesas,tmu-r8a7791  # R-Car M2-W
+          - renesas,tmu-r8a7792  # R-Car V2H
+          - renesas,tmu-r8a7793  # R-Car M2-N
+          - renesas,tmu-r8a7794  # R-Car E2
           - renesas,tmu-r8a7795  # R-Car H3
           - renesas,tmu-r8a7796  # R-Car M3-W
           - renesas,tmu-r8a77961 # R-Car M3-W+