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Rename SP_VERSION macros to MM_VERSION, which is the name used in the MM
specification [1]. Also, a few more helper macros have been added.

MM-specific definitions have been moved to their own header file.

[1] http://infocenter.arm.com/help/topic/com.arm.doc.den0060a/DEN0060A_ARM_MM_Interface_Specification.pdf



Change-Id: Ia10e48c7e81a7a1f5eeca29a5270cae740a4a88a
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>