Add capabilities() method to SDIO interface.  Remove CONFIG_SDIO_WIDTH_D1_ONLY.  That should not be a global propertie, but rather a capability/limitation of single slot when there may be multiple slots.

Typos withim mtd/ with Macronix MX25L.  In NuttX/drivers/mtd/Make.defs letters X between M and 25 are missing.  Noted by Oleg Evseev.

Module names are not needed in libc/modlib when the module library is used only for shared library support.

Move gnu-elf.ld from sched/module to libc/modlib. Update paths in Make.defs files to account for new location of file

Syscalls:  Remove modsym() syscall.  There is no reason why appication code could ever use symbolic information from a symbol within a kernel module.  The modsym() interface is only meaningful within the kernel.

Olimex STM32 P407: Add support for on-board microSD slot.  Does not work... Currently all commands to the SD card timeout.

Back out use on inline functions to access 16-bit registers.  The inline functions were a work-around for misbehaving compiler years and years ago.  The mon standard macro-ized version should work just fine.

isfinite(x) error

Add missing STM32_BKP_BASE

Added missing ARCH_HAVE_RESET for F7

SMP:  Fix timer related issues:  Round robin and sporadic scheduling were only being performed for tasks running on the CPU that processes the system timer interrupt.  Similary, CPU load measurements were only be processed for running on the CPU that receives the sampling interrupt.