dt-bindings: timer: renesas, cmt: Add CMT0234 to sh73a0 and r8a7740

Document the on-chip CMT devices included in r8a7740 and sh73a0.

Included in this patch is DT binding documentation for 32-bit CMTs
CMT0, CMT2, CMT3 and CMT4. They all contain a single channel and are
quite similar however some minor differences still exist:
 - "Counter input clock" (clock input and on-device divider)
    One example is that RCLK 1/1 is supported by CMT2, CMT3 and CMT4.
 - "Wakeup request" (supported by CMT0 and CMT2)

Because of this one unique compat string per CMT device is selected.

Signed-off-by: Magnus Damm <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>

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