feat(mt8196): add audio SMC cmd implementation

To enable audio SMMU, MTK_AUDIO_SMC_OP_DOMAIN_SIDEBANDS setting
is required to allow audio to use its own DAPC IP domain. If not
set, audio access to D

feat(mt8196): add audio SMC cmd implementation

To enable audio SMMU, MTK_AUDIO_SMC_OP_DOMAIN_SIDEBANDS setting
is required to allow audio to use its own DAPC IP domain. If not
set, audio access to DRAM will be blocked.
- Add MT8196 specific code
- Enable for MT8196

Signed-off-by: Cyril Chao <Cyril.Chao@mediatek.com>
Change-Id: I0dfc35d8a7116bcd69d6ca643a5ce527bb32676e

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