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Implement PSCI platform OPs to support CPU hotplug and MCDI.
Signed-off-by: James Liao <jamesjj.liao@mediatek.com>
Change-Id: I1321f7989c8a3d116d698768a7146e8f180ee9c0

- Add basic platform setup
- Add MT8195 documentation at docs/plat/
- Add generic CPU helper functions
- Add basic register address

Change-Id: I7978e2f32e58900e5cf93f741ee8eaf8b8e3b842
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>