feat(stm32mp2-fdts): remove pins-are-numbered

Remove the deprecated property "pins-are-numbered" from pinctrl and
pinctrl_z nodes of stm32mp25 soc to conform with the upstream series
of the link below.

Link: https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=69786

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I1ed98c94c5003bc9903229957cb072da4211238f

fdts/stm32mp251.dtsi

@@ -176,7 +176,6 @@
 			#size-cells = <1>;
 			compatible = "st,stm32mp257-pinctrl";
 			ranges = <0 0x44240000 0xa0400>;
-			pins-are-numbered;
 
 			gpioa: gpio@44240000 {
 				gpio-controller;
@@ -305,7 +304,6 @@
 			#size-cells = <1>;
 			compatible = "st,stm32mp257-z-pinctrl";
 			ranges = <0 0x46200000 0x400>;
-			pins-are-numbered;
 
 			gpioz: gpio@46200000 {
 				gpio-controller;