devicetree: bindings: Remove unused 32-bit CMT bindings

Remove the 32-bit CMT compat strings to reduce maintenance burden.

It should be fine to break DT compatibility because the 32-bit
CMT DT binding was never part of any upstream DTS file.

Signed-off-by: Magnus Damm <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>

Documentation/devicetree/bindings/timer/renesas,cmt.txt

···
 Required Properties:
 
   - compatible: must contain one or more of the following:
-    - "renesas,cmt-32-r8a7740" for the r8a7740 32-bit CMT
-		(CMT0)
-    - "renesas,cmt-32-sh73a0" for the sh73a0 32-bit CMT
-		(CMT0)
-    - "renesas,cmt-32" for all 32-bit CMT without fast clock support
-		(CMT0 on sh73a0 and r8a7740)
-		This is a fallback for the above renesas,cmt-32-* entries.
-
-    - "renesas,cmt-32-fast-r8a7740" for the r8a7740 32-bit CMT with fast
-		clock support (CMT[234])
-    - "renesas,cmt-32-fast-sh73a0" for the sh73A0 32-bit CMT with fast
-		clock support (CMT[234])
-    - "renesas,cmt-32-fast" for all 32-bit CMT with fast clock support
-		(CMT[234] on sh73a0 and r8a7740)
-		This is a fallback for the above renesas,cmt-32-fast-* entries.
-
     - "renesas,cmt-48-sh73a0" for the sh73A0 48-bit CMT
 		(CMT1)
     - "renesas,cmt-48-r8a7740" for the r8a7740 48-bit CMT