ARM: dts: at91: sama5d2: Move flx2 definitions in the SoC dtsi

The Flexcom IP is part of the sama5d2 SoC. Move the flx2 node together
with its function definitions in sama5d2.dtsi. Boards will just fill
the pins and enable the desired functions.

Signed-off-by: Tudor Ambarus <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

arch/arm/boot/dts/at91-sama5d2_icp.dts

···
 	status = "okay";
 
 	uart7: serial@200 {
-		compatible = "atmel,at91sam9260-usart";
-		reg = <0x200 0x200>;
-		interrupts = <21 IRQ_TYPE_LEVEL_HIGH 7>;
-		dmas = <&dma0
-			(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) |
-				AT91_XDMAC_DT_PERID(15))>,
-				<&dma0
-				(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) |
-				AT91_XDMAC_DT_PERID(16))>;
-		dma-names = "tx", "rx";
-		clocks = <&pmc PMC_TYPE_PERIPHERAL 21>;
-		clock-names = "usart";
 		pinctrl-0 = <&pinctrl_flx2_default>;
 		pinctrl-names = "default";
 		atmel,use-dma-rx;

arch/arm/boot/dts/sama5d2.dtsi

···
 				#size-cells = <1>;
 				ranges = <0x0 0xfc010000 0x800>;
 				status = "disabled";
+
+				uart7: serial@200 {
+					compatible = "atmel,at91sam9260-usart";
+					reg = <0x200 0x200>;
+					interrupts = <21 IRQ_TYPE_LEVEL_HIGH 7>;
+					clocks = <&pmc PMC_TYPE_PERIPHERAL 21>;
+					clock-names = "usart";
+					dmas = <&dma0
+						(AT91_XDMAC_DT_MEM_IF(0) |
+						 AT91_XDMAC_DT_PER_IF(1) |
+						 AT91_XDMAC_DT_PERID(15))>,
+						<&dma0
+						(AT91_XDMAC_DT_MEM_IF(0) |
+						 AT91_XDMAC_DT_PER_IF(1) |
+						 AT91_XDMAC_DT_PERID(16))>;
+					dma-names = "tx", "rx";
+					status = "disabled";
+				};
 			};
 
 			flx3: flexcom@fc014000 {