Add a new necessary definition needed for raspberrypi MMU support

The new ARM_CP15_CTRL_XP is necessary to share ARMv6 and ARMv7
page-table formats and definitions.
It enables the extended page tables (introduced in ARMv6)
to be configured for the hardware page translation mechanism. This way
we can share ARMv6 and ARMv7 page tables entry formats.

Other Fault Status Register Definitions can be useful for debugging or
excpetion handlers.
Shared MMU initialization for ARM BSPs and RaspberryPi MMU support

Add support for MMU initialization for RaspberryPi. Introduce new shared
MMU configuration table that can be used by other BSPs that call the
arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache function.
Demonstrate the use of the generic table with RaspberryPi.