mtd: spi-nor: Add support for XMC XM25QU128C

Add support for XMC XM25QU128C (128M-bit) Serial Flash memory. Used on
the Xunlong Orange Pi 3B, 5 and 5 Plus boards.

Datasheet:
https://www.xmcwh.com/uploads/806/XM25QU128C_Ver2.0.pdf



Signed-off-by: Ricardo Pardini <ricardo@pardini.net>
[jonas@kwiboo.se: update commit message]
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>