dt-bindings: firmware: google,gs101-acpm-ipc: convert regulators to lowercase

Using lowercase for the buck and ldo nodenames is preferred, as
evidenced e.g. in [1].

Convert the example here to lowercase before we add any bindings
describing the s2mpg1x regulators that will enforce the spelling.

Link: https://lore.kernel.org/all/20250223-mysterious-infrared-civet-e5bcbf@krzk-bin/ [1]
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20260122-s2mpg1x-regulators-v7-1-3b1f9831fffd@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: andred

Documentation/devicetree/bindings/firmware/google,gs101-acpm-ipc.yaml

@@ -75,7 +75,7 @@ examples:
             interrupts-extended = <&gpa0 6 IRQ_TYPE_LEVEL_LOW>;
 
             regulators {
-                LDO1 {
+                ldo1m {
                     regulator-name = "vdd_ldo1";
                     regulator-min-microvolt = <700000>;
                     regulator-max-microvolt = <1300000>;
@@ -84,7 +84,7 @@ examples:
 
                 // ...
 
-                BUCK1 {
+                buck8m {
                     regulator-name = "vdd_mif";
                     regulator-min-microvolt = <450000>;
                     regulator-max-microvolt = <1300000>;