dts: bindings : explains the flag for stm32 complementary channel
dts: bindings : explains the flag for stm32 complementary channel

Depending on the stm32 mcus and the timer instance, several channels
can enable the complementary output for the PWM signal.
Example of a DTS <&pwm1 2 4 (PWM_POLARITY_NORMAL | PWM_COMPLEMENTARY)>;
Note that the timer channel must support the complementary output
on that channel : usually channels 1-3 + channel 4 on stm32g4x.

Signed-off-by: Francois Ramu <b83adc7f8a23ee911a37fcb61c4033581aae0b7a@st.com>

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