pwm: meson: Enable constant and polarity features for g12, axg, s4

g12, axg and s4 SoC families support constant and polarity bits
so enable those features in corresponding chip data structs.

Signed-off-by: George Stark <gnstark@salutedevices.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20241119125318.3492261-5-gnstark@salutedevices.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>