Add an option to disable support for long long formats in lib_vsprintf.  From Alan Carvalho de Assis

STM32 F4 Discovery: Move up_cxxinitialize from nuttx/configs/stm32f4discovery/src to apps/platform/stm32f4discovery where it belongs.

Extend device specific callbacks to ICMPv6 and ARP.  Fix some IPv6 compilation errors that have crept in

SAML21-Xlplained: Add options to enable XOSC32K and to use it as the DFLL source; NSH configure now uses DFLL with OSC16M source

All minnsh configurations: Removing CONFIG_ARCH_STACKDUMP we reduce more 424 bytes.  Alan Carvalho de Assis

LPCXpresso-LPC1115:  Add a minimal NSH configuration that has the file system disabled.  Update README with OpenOCD instructions.  From Alan Carvalho de Assis.

SAMD/L: Change ordering of some initialization steps to match Atmel sample code.  Add Errate 13134 support.  SAML wait states changed to 1.  Sample code is using 0

Initial support for the NXP LPC11 family and the LPC1115 MCU in particular.  Contributed by Alan Carvalho de Assis.

SAML21 clock config: Fix a misthink in last commit.  Move setting of ONDEMAND to after clock is enabled in most cases

SAML21: Add logic to support GLCK peripheral channels; add logic to configure FDPLL lock timer and ref clock GCLKs

SAML21-Xplained:  Update the cloned SAMD20-Xplained board configuration for specifics of the SAML21-Xplained