refactor(mediatek): update EMI stub implementation

Refactor EMI stub implementation with following changes.
- Move the SiP call handlers to TF-A upstream.
- Move EMI definition used by APUSYS to pla

refactor(mediatek): update EMI stub implementation

Refactor EMI stub implementation with following changes.
- Move the SiP call handlers to TF-A upstream.
- Move EMI definition used by APUSYS to platform_def.h.
- Remove CONFIG_MTK_APUSYS_EMI_SUPPORT.

Change-Id: I30e1ee7f2ea2d6dc3415adba91cbe310af9b5eeb
Signed-off-by: Yidi Lin <yidilin@chromium.org>

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feat(mt8196): add Mediatek EMI stub implementation for mt8196

Implement stub functions for the EMI driver to ensure that the build
can pass when a prebuilt library is not available.

Change-Id: I296

feat(mt8196): add Mediatek EMI stub implementation for mt8196

Implement stub functions for the EMI driver to ensure that the build
can pass when a prebuilt library is not available.

Change-Id: I296945a3df6766a3a133cd385a1e5038ca979403
Signed-off-by: Gavin Liu <gavin.liu@mediatek.corp-partner.google.com>

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