Master
configs/nucleo-f334r8: add example for the SPWM generation (custom STM32 PWM usage)
arch/arm/src/stm32/stm32_pwm: fix compilation errors if the upper-half PWM logic is not enabled
include/nuttx/drivers/pwm.h: remove dependency on CONFIG_PWM for the upper-half PWM header. This allows compilation for the lower-level PWM drivers even if the upper-half PWM logic is not used.
arch/arm/src/stm32/stm32_tim.c: fix compilation error if there is no TIM8
configs/nucleo-f334r8/highpri: remove the upper-half ADC from configuration
configs/nucleo-f302r8/highpri: remove the upper-half ADC from configuration
configs/stm32f429i-disco/highpri: remove the upper-half ADC from configuration
Approved-by: GregoryN <gnutt@nuttx.org>
