lantiq: TDW89x0 - increase spi frequency

Use the same max spi frequency as set in u-boot.

According to the datasheets, the Q64-104HIP as well as the Winbond
25Q64FVSIG support spi frequencies up to 50 MHz. During my tests, the
Q64-104HIP couldn't be recognized/initialized if the frequency
was > 40MHz.

Both chips do support fast read as well.

While touching the dts file, I fixed the dtc compiler warnings.

Signed-off-by: Mathias Kresin <openwrt@kresin.me>

SVN-Revision: 47994

target/linux/lantiq/dts/TDW89X0.dtsi

@@ -16,12 +16,14 @@
 			interrupt-parent = <&icu0>;
 			interrupts = <22 23 24>;
 			#address-cells = <1>;
+			#size-cells = <1>;
 			m25p80@0 {
 				#address-cells = <1>;
 				#size-cells = <1>;
 				compatible = "jedec,spi-nor";
-				reg = <3>;
-				spi-max-frequency = <20000000>;
+				reg = <3 0>;
+				spi-max-frequency = <33250000>;
+				m25p,fast-read;
 
 				partition@0 {
 					reg = <0x0 0x20000>;