ArmPkg/Include: Add SVC function IDs for Management Mode.
ArmPkg/Include: Add SVC function IDs for Management Mode.

SVCs are in the range 0xC4000060 - 0xC400007f.
The functions available to the secure MM partition:
1. Signal completion of MM event handling.
2. Set/Get memory attributes for a memory region at runtime.
3. Get version number of secure partition manager.

Also, it defines memory attributes required for set/get operations.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Supreeth Venkatesh <e636ad8a3c68a860c3594da0efc73a6a46c31f2f@arm.com>
Reviewed-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>

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