spi: sf: better support of ich spi driver for SST25VF016B flash

commit cce9156 changes spi flash default read command to
CMD_READ_ARRAY_SLOW (03h), which works for TunnelCreek SPI
controller but is not necessary for other controllers.

This change reverts commit cce9156 and updates the ich spi
driver as well as the SST25VF016B flash parameters to make
sure ich spi driver selects the slow read command for the
SST25VF016B flash.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>