clk: pwm: Let .get_duty_cycle() return the real duty cycle

clk: pwm: Let .get_duty_cycle() return the real duty cycle

pwm_get_state() returns the last requested pwm_state which might differ
from what the lowlevel PWM driver actually implemented. For the purpose
of .get_duty_cycle() the latter is the more interesting info, so use
that to determine the output parameter.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/3db08ded39c09aaa5004b3b8b1238111f199e819.1746006578.git.ukleinek@baylibre.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>