sf: winbond: Add support for W25Q80BW

Add support for Winbond W25Q80BW SPI flash.

This patch corrected the flash name, nr_blocks and
also commit message header from below patch.
"sf: winbond: add W25Q32"
(sha1: c969abc4)

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>