pthread cleanup stack:  Replace critical section with sched_lock/unlock().  The cleanup stack modification only needs to have the TCB stationary.  The stack is never modified from interrupt level logic

For Cortex-A9, should also set ACTLR.FW in SMP mode to enble TLB and cache broadcasts.  Does not fix SMP cache problem.

Allow a config to override the SDIO clock edge setting

Remove BOARDIOC_CAN_INITIALIZE.  CAN initializaiton is now performed in board bring-up logic just like every other device driver.

Remove BOARDIOC_CAN_INITIALIZE.  CAN initialization is now done in the board initialization logic just like every other device driver.

Upstream to greg

   Added missing bits definitions
   Used stm32F469 and stm32f446 bit definitions
   Removed unsed header file