Merged in raiden00/nuttx (pull request #516)

Master

* stm32_hrtim: fix warnings related with RCC

* stm32f33xxx_adc: add some publicly visable interfaces and some code to support injected channels

* stm32f33xxx_dma: add public interface to handle with DMA interrupts

* stm32_hrtim: change some names and add some coments

* chip/stm32f33xxx_adc.h: cosmetics

* nucleo-f334r8: add logic for zero latency high priority interrupts example

* stm32: update some ADC-related configuration in Kconfig

Approved-by: Gregory Nutt <gnutt@nuttx.org>