dts: switch spi-flash to jedec, spi-nor compatible

There is no reason not to use the Linux "jedec,spi-nor" binding in U-Boot
dts files. This compatible has been added in sf_probe, let use it.

This patch switches to jedec,spi-nor when spi-flash is used in the DTS
and DTSI files, and removed spi-flash when jedec,spi-nor is already
present.

The x86 dts are switched in a separate commit since it depends on a change
in fdtdec.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: Evgeniy Paltsev <paltsev@synopsys.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Patrick Delaunay <Patrick.delaunay@st.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/arch/arm/dts/kirkwood-ns2-common.dtsi b/arch/arm/dts/kirkwood-ns2-common.dtsi
index f997bb4..51530ea 100644
--- a/arch/arm/dts/kirkwood-ns2-common.dtsi
+++ b/arch/arm/dts/kirkwood-ns2-common.dtsi
@@ -30,7 +30,7 @@
 			flash@0 {
 				#address-cells = <1>;
 				#size-cells = <1>;
-				compatible = "mxicy,mx25l4005a", "jedec,spi-nor", "spi-flash";
+				compatible = "mxicy,mx25l4005a", "jedec,spi-nor";
 				reg = <0>;
 				spi-max-frequency = <20000000>;
 				mode = <0>;