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>