Merge changes from topic "st_regulator" into integration
* changes:
feat(st-sdmmc2): manage cards power cycle
feat(stm32mp1): register fixed regulator
feat(st-drivers): introduce fixed regulator driver
refactor(st): update CPU and VDD voltage get
refactor(stm32mp1-fdts): update regulator description
refactor(st-pmic): use regulator framework for DDR init
feat(st-pmic): register the PMIC to regulator framework
refactor(st-pmic): split initialize_pmic()
feat(stm32mp1): add regulator framework compilation
feat(regulator): add a regulator framework
feat(stpmic1): add new services
feat(stpmic1): add USB OTG regulators
refactor(st-pmic): improve driver usage
refactor(stpmic1): set stpmic1_is_regulator_enabled() as boolean
refactor(stm32mp1): re-order drivers init