[S] Change in flashrom[main]: flashchips: Add Support for XMC XM25QU512C/XM25QU512D

[Ssunk (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Nikolai Artemiev, Stefan Reinauer.

Ssunk has posted comments on this change by Ssunk. ( https://review.coreboot.org/c/flashrom/+/83243?usp=email )

Change subject: flashchips: Add Support for XMC XM25QU512C/XM25QU512D
......................................................................

Patch Set 4:

(1 comment)

File flashchips.c:

https://review.coreboot.org/c/flashrom/+/83243/comment/9e08c614_095570c2?usp... :
PS2, Line 22495: FEATURE_4BA_ENTER_WREN
> Does enter/exit 4-byte mode depend on WREN? Or can it be done without WREN? […]

Since 256Mb or more requires 4 bytes for addressing, the enter/exit 4-byte address mode operation is required.
XMC has defined enter/exit 4-byte address mode without WREN (06h) command in the SFDP table of 256Mb+ capacity Datasheet.
We don't need to add WREN (06h) command before enter/exit 4-byte address mode, but it's OK to add WREN (06h) command or no WREN (06h) command in front of it, it won't affect.