Spreadtrum 7sreset bindings

This IP block in the unisoc SoC that only deals with hardware reboot-force.

Required properties:
- compatible:
  -"sprd,sc2720-7sreset" for SC2720 7sreset
  -"sprd,sc2721-7sreset" for SC2721 7sreset
  -"sprd,sc2730-7sreset" for SC2730 7sreset
  -"sprd,sc2731-7sreset" for SC2731 7sreset

- reg: Specifies the physical address of the SWRST_CTL0 and POR_7S_CTL register.

Example:
hw-reset@1bc0 {
	compatible = "sprd,sc2730-7sreset";
	reg = <0x1bf8>, <0x1bc0>;
};

