spi: add MX25U1635E flash

spi: add MX25U1635E flash

* Macronix 16 MBit SPI flash
* https://www.macronix.com/en-us/products/NOR-Flash/Serial-NOR-Flash/Pages/spec.aspx?p=MX25R1635F&m=Serial%20NOR%20Flash&n=PM2161
* used e.g. on Andestech ADP-XC7KFF676

Change-Id: Ida701cf3832e3302aa29b4dded1c390c5ff8c482
Signed-off-by: Hellosun Wu <wujiheng.tw@gmail.com>
Reviewed-on: http://openocd.zylin.com/5428
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>