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/mips/dts/luton_pcb090.dts b/arch/mips/dts/luton_pcb090.dts
index 315172b..fe457ba 100644
--- a/arch/mips/dts/luton_pcb090.dts
+++ b/arch/mips/dts/luton_pcb090.dts
@@ -48,7 +48,7 @@
 &spi0 {
 	status = "okay";
 	spi-flash@0 {
-		compatible = "spi-flash";
+		compatible = "jedec,spi-nor";
 		spi-max-frequency = <18000000>; /* input clock */
 		reg = <0>; /* CS0 */
 		spi-cs-high;