ARM: st: add new compatible for PWR regulators on

Merge series from Patrick Delaunay <patrick.delaunay@foss.st.com>:

This patchset adds the new PWR regulators compatible for STM32MP13:
"st,stm32mp13-pwr-reg".

As this node is just introduced by [1] and it is is not used by any
board in Linux,  it is the good time to introduced this compatible
and update the STM32MP13 SoC dtsi without ABI break.

A new compatible is needed as the content of the PWR_CR3 register,
used by this driver change with new bits on STM32MP13 for SD IO domain:
- bit 23: VDDSD2VALID
- bit 22: VDDSD1VALID
- bit 16: VDDSD2RDY
- bit 15: VDDSD2EN
- bit 14: VDDSD1RDY
- bit 13: VDDSD1EN

I will push a update on STM32MP13 SoC dtsi if this new compatible
is accepted to preserve the bisectability.

[1] commit f798f7079233 ("ARM: dts: stm32: add PWR regulators support on stm32mp131")
    https://lore.kernel.org/linux-arm-kernel/b89d0531-067f-4356-91b0-ed7434cee3d7@foss.st.com/

Documentation/devicetree/bindings/regulator/st,stm32mp1-pwr-reg.yaml

@@ -11,7 +11,12 @@ maintainers:
 
 properties:
   compatible:
-    const: st,stm32mp1,pwr-reg
+    oneOf:
+      - items:
+          - const: st,stm32mp1,pwr-reg
+      - items:
+          - const: st,stm32mp13-pwr-reg
+          - const: st,stm32mp1,pwr-reg
 
   reg:
     maxItems: 1

drivers/regulator/stm32-pwr.c

@@ -166,6 +166,7 @@ static int stm32_pwr_regulator_probe(struct platform_device *pdev)
 
 static const struct of_device_id __maybe_unused stm32_pwr_of_match[] = {
 	{ .compatible = "st,stm32mp1,pwr-reg", },
+	{ .compatible = "st,stm32mp13-pwr-reg", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, stm32_pwr_of_match);