doc: device-tree-bindings: switch from spi-flash to jedec, spi-nor

Since all DTS files has been switched to "jedec,spi-nor", remove
the "spi-flash" compatible from the bindings examples.
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: NSimon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: NRick Chen <rick@andestech.com>
Reviewed-by: NPatrick Delaunay <Patrick.delaunay@st.com>
Reviewed-by: NJagan Teki <jagan@openedev.com>

doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt

@@ -42,7 +42,7 @@ Example:
 		status = "okay";
 
 		spi_flash@0 {
-			compatible = "spi-flash";
+			compatible = "jedec,spi-nor";
 			reg = <0>;
 			spi-max-frequency = <50000000>;
 		};

doc/device-tree-bindings/spi/spi-atcspi200.txt

@@ -28,7 +28,7 @@ Example:
 		clocks = <&spiclk>;
 		interrupts = <3 4>;
 		flash@0 {
-			compatible = "spi-flash";
+			compatible = "jedec,spi-nor";
 			spi-max-frequency = <50000000>;
 			reg = <0>;
 			spi-cpol;

doc/device-tree-bindings/spi/spi-stm32-qspi.txt

@@ -29,7 +29,7 @@ Example:
 		qflash0: n25q128a {
 			#address-cells = <1>;
 			#size-cells = <1>;
-			compatible = "micron,n25q128a13", "spi-flash";
+			compatible = "micron,n25q128a13", "jedec,spi-nor";
 			spi-max-frequency = <108000000>;
 			spi-tx-bus-width = <4>;
 			spi-rx-bus-width = <4>;