mtd: spi-nor-ids: change full company name of XTX

XTX changed full company name from "XTX Technology (Shenzhen) Limited
to "XTX Technology Limited" since 2020,So remove "(Shenzhen)".

Signed-off-by: Bruce Suen <bruce_suen@163.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>