enable GMSK

explicit that ASK/OOK is not supported yet
set msk phase shift duration when selecting msk

add settings to set default freq at boot
more cc1101 config

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.

6loWPAN:  Add some checks for the case where there are multiple network devices and multiple link layer protocols.

not a clean fix, but at least makes DHCP working with CONFIG_NETDEV_MULTINIC

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