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module/optee: Add voltage domain regulators

Darryl Green requested to merge github/fork/etienne-lms/optee-voltd-regulator into master

Created by: etienne-lms

Implements an OP-TEE voltage domain regulator module for voltage domains accessed through OP-TEE voltage regulators. OP-TEE regulator framework API is described in drivers/regulator.h header file [1].

The module treats voltage domains with a NULL OP-TEE regulator reference as voltage domain client cannot use yet allowing the client to query information about. In such case, the domain is treated as a reserved always off zero volt fixed voltage regulator.

[1] https://github.com/OP-TEE/optee_os/blob/master/core/include/drivers/regulator.h

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