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: NMagnus Damm <damm+renesas@opensource.se>
Acked-by: NRob Herring <robh@kernel.org>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>