power: domain: mediatek: add support for the power-controller model

The current driver handles a flat scpsys node with a single, fixed set
of power status registers and one infracfg bus-protection mask. Newer
MediaTek SoCs describe their domains as child nodes of a power
controller and need a richer model:

  - per-domain power status register offsets (pwr_sta_offs /
    pwr_sta2nd_offs), falling back to the legacy SPM_PWR_STATUS
    registers when not set;
  - an ordered list of bus-protection steps (scpsys_bus_prot_data /
    BUS_PROT_WR), each with its own set/clear/status register, applied
    on power-off and released in reverse on power-on;
  - per-domain clocks and an optional parent power domain.

Add mtk_power_controller_probe(), which walks the controller's subnodes,
resolves each domain's id, clocks and infracfg, and builds the domain
tree. The existing flat probe (mtk_scpsys_probe) is left unchanged.

No functional change for the existing MT7623/MT7629 drivers.

Signed-off-by: Julien Stephan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: David Lechner <[email protected]>

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