arm64: dts: mediatek: mt8192-asurada-spherion: Mark trackpads as fail-needs-probe

Different Spherion variants use different trackpads on the same I2C2
bus. Instead of enabling all of them by default, mark them as
"fail-needs-probe" and let the implementation determine which one is
actually present.

Additionally, move the trackpad pinctrl entry back to the individual
trackpad nodes.

Signed-off-by: Laura Nao <laura.nao@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250318102259.189289-3-laura.nao@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: laura-nao

arch/arm64/boot/dts/mediatek/mt8192-asurada-spherion-r0.dts

@@ -85,8 +85,15 @@
 	trackpad@2c {
 		compatible = "hid-over-i2c";
 		reg = <0x2c>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&trackpad_pins>;
 		hid-descr-addr = <0x20>;
 		interrupts-extended = <&pio 15 IRQ_TYPE_LEVEL_LOW>;
 		wakeup-source;
+		status = "fail-needs-probe";
 	};
 };
+
+&trackpad {
+	status = "fail-needs-probe";
+};

arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi

@@ -346,11 +346,13 @@
 	clock-frequency = <400000>;
 	clock-stretch-ns = <12600>;
 	pinctrl-names = "default";
-	pinctrl-0 = <&i2c2_pins>, <&trackpad_pins>;
+	pinctrl-0 = <&i2c2_pins>;
 
-	trackpad@15 {
+	trackpad: trackpad@15 {
 		compatible = "elan,ekth3000";
 		reg = <0x15>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&trackpad_pins>;
 		interrupts-extended = <&pio 15 IRQ_TYPE_LEVEL_LOW>;
 		vcc-supply = <&pp3300_u>;
 		wakeup-source;