xilinx: Add jedec compatible string for QSPI (Zynq/ZynqMP)

Add missing "jedec, spi-nor" compatible string for QSPI flash node.
Spi-nor framework uses this compatibility string to probe &
initialize flash. With missing compatibility string we are observing
below error:

Zynq> sf probe 0 0 0
 jedec_spi_nor spi_flash@0:0: unrecognized JEDEC id bytes:
00, 00, 00  Failed to initialize SPI flash at 0:0 (error -2)
Signed-off-by: NRaju Kumar Pothuraju <raju.kumar-pothuraju@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynq-cc108.dts

@@ -58,7 +58,7 @@
 	is-dual = <0>;
 	num-cs = <1>;
 	flash@0 { /* 16 MB */
-		compatible = "n25q128a11";
+		compatible = "n25q128a11", "jedec,spi-nor";
 		reg = <0x0>;
 		spi-max-frequency = <50000000>;
 		spi-tx-bus-width = <1>;

arch/arm/dts/zynq-cse-qspi.dtsi

@@ -60,7 +60,7 @@
 			#size-cells = <0>;
 			num-cs = <1>;
 			flash0: flash@0 {
-				compatible = "n25q128a11";
+				compatible = "n25q128a11", "jedec,spi-nor";
 				reg = <0x0>;
 				spi-tx-bus-width = <1>;
 				spi-rx-bus-width = <4>;

arch/arm/dts/zynq-topic-miami.dts

@@ -36,7 +36,7 @@
 	is-dual = <0>;
 	num-cs = <1>;
 	flash@0 {
-		compatible = "st,m25p80", "n25q256a";
+		compatible = "st,m25p80", "n25q256a", "jedec,spi-nor";
 		m25p,fast-read;
 		reg = <0x0>;
 		spi-tx-bus-width = <1>;

arch/arm/dts/zynqmp-topic-miamimp-xilinx-xdp-v1r1.dts

@@ -58,7 +58,7 @@
 	status = "okay";
 	is-dual = <1>;
 	flash@0 {
-		compatible = "st,m25p80", "n25q256a";
+		compatible = "st,m25p80", "n25q256a", "jedec,spi-nor";
 		m25p,fast-read;
 		reg = <0x0>;
 		spi-tx-bus-width = <1>;