Rename CONFIG_ARMV7M_MPU to CONFIG_ARM_MPU so that we can reuse the configuration settings for the ARMV7R MPU

STM32: Fix typos in pinmaps

STM32: Fix typos in STM32F30xxx pinmap

Add initial support for ARMv7-R architecture.  Initial commit is largely a clone of ARMv7-A and needs further review

All architectures need to build ELF support if either CONFIG_ELF or CONFIG_MODULE are selected.  Cortex-M7 also must support module cache corherence

SAMV7 USBHS device: Last change fixed certain problems and introduced some new ones.  Here is an untested fix to address all known problems