stm32 h7 Add ADC and a few fixes for timer and Serial
* stm32h7:Fix error when SINGLEWIRE or CONFIG_STM32H7_SERIALBRK_BSDCOMPAT defined
* stm32h7:time fixed compile errors with TIM13,TIM14, TIM7
* stm32h7:Added ADC Driver
* stmh7x3:Added ADC pins to pin map
* stm32h7:Added ADC clocking
* nucleo-h743zi:Add ADC
Approved-by: Gregory Nutt <gnutt@nuttx.org>