flash/nor/spi: add flash Micron n25q064

Change-Id: Ic39bb6d020767cece2eaa4e194071be8b002ece4
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/1452
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
flash/nor/spi: uniform all hex data to lowercase

Change-Id: I3daee7218283e521bf490993dba02a8658540951
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/1453
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>