The XMC XM25QH64C is a 8MB SPI NOR chip. The patch is verified on TL-WPA8631P v3.
Datasheet available at https://www.xmcwh.com/uploads/442/XM25QH64C.pdf
Signed-off-by: Joe Mullally <jwmullally@gmail.com>
(cherry picked from commit 19752bdfa3e75da8290f525186e9fd8349df9c93)