ARM: dts: microchip: at91-sama7g5ek: Replace regulator-suspend-voltage with the valid property

By checking the pmic node with microchip,mcp16502.yaml#
'regulator-suspend-voltage' does not match any of the
regexes 'pinctrl-[0-9]+' from schema microchip,mcp16502.yaml#
which inherits regulator.yaml#. So replace regulator-suspend-voltage
with regulator-suspend-microvolt to avoid the inconsitency.

Fixes: 85b1304 ("ARM: dts: at91: sama7g5ek: set regulator voltages for standby state")
Signed-off-by: Andrei Simion <andrei.simion@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20240404123824.19182-2-andrei.simion@microchip.com
[claudiu.beznea: added a dot before starting the last sentence in commit
 description]
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: Andrei Simion

arch/arm/boot/dts/microchip/at91-sama7g5ek.dts

@@ -293,7 +293,7 @@
 
 					regulator-state-standby {
 						regulator-on-in-suspend;
-						regulator-suspend-voltage = <1150000>;
+						regulator-suspend-microvolt = <1150000>;
 						regulator-mode = <4>;
 					};
 
@@ -314,7 +314,7 @@
 
 					regulator-state-standby {
 						regulator-on-in-suspend;
-						regulator-suspend-voltage = <1050000>;
+						regulator-suspend-microvolt = <1050000>;
 						regulator-mode = <4>;
 					};
 
@@ -331,7 +331,7 @@
 					regulator-always-on;
 
 					regulator-state-standby {
-						regulator-suspend-voltage = <1800000>;
+						regulator-suspend-microvolt = <1800000>;
 						regulator-on-in-suspend;
 					};
 
@@ -346,7 +346,7 @@
 					regulator-max-microvolt = <3700000>;
 
 					regulator-state-standby {
-						regulator-suspend-voltage = <1800000>;
+						regulator-suspend-microvolt = <1800000>;
 						regulator-on-in-suspend;
 					};