eeprom: at25: fram: Detect and support inside-out chip variants

Infineon seems to be confused with the order ID bytes should be presented
by the FRAM chips and to be on the safe side they offer chips which are
either JEDEC conform or the full opposite of the latter.

Examples of the chips which present ID bytes in the reversed order are:
CY15B102QN
CY15B204QSN

Let's support them nevertheless. Except reversing the ID bytes, they also
have quite different density encoding even across EXCELON(tm) family.

The patch has been tested with the above two chips.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Link: https://lore.kernel.org/r/20250702222927.864875-1-alexander.sverdlin@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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