[SANTINO][DTS] Comment-out nodes without suitable drivers

The imported nodes:
- `spreadspectrum`
- `gfplatdetect`
have no suitable driver. These nodes have been commented-out in order
restore them once the related drivers will be ported.

arch/arm/boot/dts/seco/seco-imx6qdl-san.dtsi

@@ -110,20 +110,21 @@
 		assigned-clock-rates = <12000000>, <12000000>, <12000000>;
 	};
 
-	gfplatdetect: gfplatdetect {
-		compatible = "guf,imx6q-platdetect";
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_pfid>;
-
-		pfid-gpios = 	<&gpio2 0 GPIO_ACTIVE_HIGH>,
-			<&gpio2  1 GPIO_ACTIVE_HIGH>,
-			<&gpio2  2 GPIO_ACTIVE_HIGH>,
-			<&gpio5  4 GPIO_ACTIVE_HIGH>,
-			<&gpio2  5 GPIO_ACTIVE_HIGH>,
-			<&gpio2  6 GPIO_ACTIVE_HIGH>,
-			<&gpio2  7 GPIO_ACTIVE_HIGH>,
-			<&gpio6 16 GPIO_ACTIVE_HIGH>;
-	};
+	/* guf,imx6q-platdetect driver not available */
+	// gfplatdetect: gfplatdetect {
+	// 	compatible = "guf,imx6q-platdetect";
+	// 	pinctrl-names = "default";
+	// 	pinctrl-0 = <&pinctrl_pfid>;
+
+	// 	pfid-gpios = 	<&gpio2 0 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio2  1 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio2  2 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio5  4 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio2  5 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio2  6 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio2  7 GPIO_ACTIVE_HIGH>,
+	// 		<&gpio6 16 GPIO_ACTIVE_HIGH>;
+	// };
 
 	reg_5P0: regulator-5P0 {
 		compatible = "regulator-fixed";
@@ -194,13 +195,14 @@
 		status = "disabled";
 	};
 
-	spreadspectrum: spreadspectrum {
-		compatible = "guf,imx6-spreadspectrum";
-		step = <1>;
-		stop = <250>;
-		denom = <400>;
-		enabled = <1>;
-	};
+	/* guf,imx6-spreadspectrum driver not available */	
+	// spreadspectrum: spreadspectrum {
+	// 	compatible = "guf,imx6-spreadspectrum";
+	// 	step = <1>;
+	// 	stop = <250>;
+	// 	denom = <400>;
+	// 	enabled = <1>;
+	// };
 };
 
 &audmux {