feat(mt8189): add UFS functions used by libbl31.a

Add UFS callback functions needed by the MediaTek's
private static library (libbl31.a).

Signed-off-by: Cloud Zhang <cloud.zhang@mediatek.corp-partn

feat(mt8189): add UFS functions used by libbl31.a

Add UFS callback functions needed by the MediaTek's
private static library (libbl31.a).

Signed-off-by: Cloud Zhang <cloud.zhang@mediatek.corp-partner.google.com>
Change-Id: I155b5a805a953e45f1a41a561f1d82f71b99541d

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