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mediatek: common: use hacc API to generate the HUK

Alexandre Bailon requested to merge abailon/trusted-firmware-a:abailon/hacc into mtk-v2.6

We are using the HWID as HUK but this can be read from non secure world so this can't be used for secure storage. Use the hacc API, that relies on HW only available from secure world.

Note: There is an option, HUK_LEGACY, that allow to use HWID as HUK. This is required for the board already provisioned using HWID as HUK.

Signed-off-by: Alexandre Bailon abailon@baylibre.com

Edited by Alexandre Bailon

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