feat(mt8196): initialize platform for MediaTek MT8196

- Add basic platform setup.
- Add MT8196 documentation at docs/plat/.
- Add generic CPU helper functions.
- Add basic register address.
- Add ti

feat(mt8196): initialize platform for MediaTek MT8196

- Add basic platform setup.
- Add MT8196 documentation at docs/plat/.
- Add generic CPU helper functions.
- Add basic register address.
- Add timer driver configuration.

Change-Id: I07fcdeb785fcda4a955c11c39a345da4ad05ef04
Signed-off-by: Gavin Liu <gavin.liu@mediatek.com>

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