wireless/ieee802154: Starts structuring transmission completion handling

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

wireless/ieee802154: Removes uneccessary structs surrounding bit-fields in mac802154.c

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

Ieee802154

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

wireless/ieee802154: Simplifies MAC callback interface.  Adds missing data type definitions

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

stm32:stm32_serial fixed warning

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

wireless/ieee802154: Lots of small fixes to eliminate build issues.

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

Kinetis:Fixed warning

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

Generally cleans things up and fixes lots of small issues preventing a successful build.  Does not completely build, but there are significantly less errors

STM32F0:  The STM32F2 does not have use alternate function groupings as does the F1.  Rather, it is like other members of the STM32 family with An alternate setting AF0-AF7 for each pin.

Move: CONFIG_ADC_NO_START_CONV from drivers/adc/Kconfig to arch/arm/src/stm32[f7]/Kconfig as STM32[F7]_ADC_NO_START_CONV.  Refresh all configurations with any reference to CONFIG_ADC_NO_START_CONV.

STM32F7: warn if no DMA2 configured when using ADC with DMA.  Also correct ADC channel numbers that DMA callback passes to upper half driver.

Move enabling of GPIO peripherals form UART setup to clockconfig.  This is not a UART function.  It is needed by all periphrals.