Make the option positively named, and as it is a platform config
option make sure it only affects platform code.
HAL functions still remain available even if platform is told not
to use them.
Make the following changes:
-Allow a vector specific ARM MPU driver by defining MBED_MPU_CUSTOM
-Allow ROM address to be configured for ARMv7-M devices by
setting the define MBED_MPU_ROM_END
-Add ROM write protection
-Add new functions and lock
-enable at boot
-disable during flash programming
Enable the MPU as part of the boot sequence and disable it before
starting a new application. Also add reference counted MPU lock and
unlock functions to allow code to execute from ram when necessary.
Russ Butler
Kevin Bracey