SAMV71 QSPI: Use new QSPI interface.  Can't use SPI interface as planned; the hardware architectue is too different

Networking:  Move where the local loopback device is initialized from board_app_intiialize() to up_intiialize() so that it will happen automatically

Upstream_446_clock

LPC17: Fix RAM vector table alignment for the LPC17 family.  The ARMv7-M TRM only requires 128-byte alignment for vector tables; the LPC17, however, requires 256 byte alignment

arch/arm/src/lpc17: Actually implement options to use external SDRAM and or SRAM for the heap.  From Pavel Pisa

Upstream_446

SAMV7 QSPI: Add framework for a  QSPI driver.  Initial commit is just the SPI driver with some name changes

SAMV7 USBHS Device:  After aligning DMA buffers and disabling write-back data cache, the DCD driver is fully functional using the CDC/ACM device

All ARMV7-M IRQ setup:  Always set the NVIC vector table address.  This is needed in cases where the code is running with a bootload and when the code is running from RAM.  It is also needed by the logic of up_ramvec_initialize() which gets the vector base address from the NVIC.  Suggested by Pavel Pisa

This fix allows to run NuttX from SRAM or to place it after bootloader when run from Flash.  From Pavel Pisa

STM32: Fix eth mem leak in recvframe