ARM: dts: imx: Replace "simple-bus" with "simple-mfd" for anatop

Replace "simple-bus" with "simple-mfd" for anatop node in order
to fix the following build warnings with W=1:

arch/arm/boot/dts/imx6sx.dtsi:603.31-616.7: Warning (simple_bus_reg): /soc/aips-bus@2000000/anatop@20c8000/regulator-1p1: missing or empty reg/ranges property
arch/arm/boot/dts/imx6sx.dtsi:618.31-631.7: Warning (simple_bus_reg): /soc/aips-bus@2000000/anatop@20c8000/regulator-3p0: missing or empty reg/ranges property
arch/arm/boot/dts/imx6sx.dtsi:633.31-646.7: Warning (simple_bus_reg): /soc/aips-bus@2000000/anatop@20c8000/regulator-2p5: missing or empty reg/ranges property
arch/arm/boot/dts/imx6sx.dtsi:648.32-663.7: Warning (simple_bus_reg): /soc/aips-bus@2000000/anatop@20c8000/regulator-vddcore: missing or empty reg/ranges property
arch/arm/boot/dts/imx6sx.dtsi:665.33-679.7: Warning (simple_bus_reg): /soc/aips-bus@2000000/anatop@20c8000/regulator-vddpcie: missing or empty reg/ranges property
arch/arm/boot/dts/imx6sx.dtsi:681.31-696.7: Warning (simple_bus_reg): /soc/aips-bus@2000000/anatop@20c8000/regulator-vddsoc: missing or empty reg/ranges property

Based on a patch from Marco Felsch for the imx6qdl.dtsi.

Cc: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sl.dtsi

@@ -525,7 +525,7 @@ clks: ccm@20c4000 {
 			anatop: anatop@20c8000 {
 				compatible = "fsl,imx6sl-anatop",
 					     "fsl,imx6q-anatop",
-					     "syscon", "simple-bus";
+					     "syscon", "simple-mfd";
 				reg = <0x020c8000 0x1000>;
 				interrupts = <0 49 IRQ_TYPE_LEVEL_HIGH>,
 					     <0 54 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx6sll.dtsi

@@ -507,7 +507,7 @@ clks: clock-controller@20c4000 {
 			anatop: anatop@20c8000 {
 				compatible = "fsl,imx6sll-anatop",
 					     "fsl,imx6q-anatop",
-					     "syscon", "simple-bus";
+					     "syscon", "simple-mfd";
 				reg = <0x020c8000 0x4000>;
 				interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>,
 					     <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx6sx.dtsi

@@ -594,7 +594,7 @@ clks: ccm@20c4000 {
 
 			anatop: anatop@20c8000 {
 				compatible = "fsl,imx6sx-anatop", "fsl,imx6q-anatop",
-					     "syscon", "simple-bus";
+					     "syscon", "simple-mfd";
 				reg = <0x020c8000 0x1000>;
 				interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>,
 					     <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx6ul.dtsi

@@ -558,7 +558,7 @@ clks: ccm@20c4000 {
 
 			anatop: anatop@20c8000 {
 				compatible = "fsl,imx6ul-anatop", "fsl,imx6q-anatop",
-					     "syscon", "simple-bus";
+					     "syscon", "simple-mfd";
 				reg = <0x020c8000 0x1000>;
 				interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>,
 					     <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>,

arch/arm/boot/dts/imx7s.dtsi

@@ -559,7 +559,7 @@ cpu_speed_grade: speed-grade@10 {
 
 			anatop: anatop@30360000 {
 				compatible = "fsl,imx7d-anatop", "fsl,imx6q-anatop",
-					"syscon", "simple-bus";
+					"syscon", "simple-mfd";
 				reg = <0x30360000 0x10000>;
 				interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>,
 					<GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>;