SAM3/4: SPI and HSCMI drivers with now use the CMCC is available; The SPI driver will now handle word sizes greater than 8-bits

For all configurations that have the default pthread stacksize set to some other value than 2048 AND which have the USB MSC device class enabled, add a definition of CONFIG_USBMSC_SCSI_STACKSIZE so that the size of the stack used by USB MSC SCSI worker thread does not increase

apps/system/usbmsc:  Back out kludge that is no longer needed with the recent fix to the USB MSC class

Add missing HSCMI configuration options; Make HSMCI configuration naming more compatible; Fix HSCMI clocking to use the CLKODD bit