core: pta: widevine: Add the init implementation

On the new ChromeOS mediatek platform, we will use the device tree to
pass hardware unique key and the parameters for widevine TAs.

Signed-off-by: Y

core: pta: widevine: Add the init implementation

On the new ChromeOS mediatek platform, we will use the device tree to
pass hardware unique key and the parameters for widevine TAs.

Signed-off-by: Yi Chou <yich@google.com>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

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