Add support for STM32L152CC, STM32L152RC and STM32L152VC.  Update some bits and comments for other STM32L1 parts in chip.h

STM32 L1: stm32l15xx_rcc: Allow board to configure HSE clock in bypass-mode.  Allows using MCO output from ST-link chip (on Nucleo and Discovery boards) as HSE input.

SAMV7 EMAC:  Add conditional logic to account the fact that the SAMV71 has 6 rather than 3 queues after version 1.

stm32:stm32_serial fixed warning

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

Kinetis:Fixed warning

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

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.