nand: raw: octeontx: Make list static

octeontx_bch_devices and octeontx_pci_nand_deferred_devices are only
referenced in the files where they are defined. Make them static.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Acked-by: Michael Trimarchi <michael@amarulasolutions.com>
Link: https://lore.kernel.org/all/20230405143837.785082-1-bmeng@tinylab.org/


Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>