Documentation: devicetree: mtd: add w25q64 to list of supported SPI flashes

W25Q64 is found on TI's AM335x ICEv2 board. Add it to list
for supported SPI flash devices. This flash can be identified
using JEDEC READ ID opcode.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt

@@ -40,6 +40,7 @@ Required properties:
                  w25x80
                  w25x32
                  w25q32
+                 w25q64
                  w25q32dw
                  w25q80bl
                  w25q128