arch/arm/src/stm32f7: port PWM driver from arch/stm32
This change adds support for the following features: 1. PWM complementary outputs 2. interface for low-level PWM operations 3. support for all PWM channel modes 4. support for internal PWM channels (TIM1/TIM8) 5. support for PWM channel polarity and IDLE state 6. support for TRGO and BREAK
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