Merge branch 'u-boot-nand-20241126' of https://source.denx.de/u-boot/custodians/u...

CI: https://source.denx.de/u-boot/custodians/u-boot-nand-flash/-/pipelines/23584

Remove device specific nand driver files as they are now replaced by a
common driver bcmbca_nand.c

Make use of OF_UPSTREAM which uses Linux dts.

Implement a minimal set of defconfig options to enable basic NAND
functionality. Tested on:
47622
63146
63158
63178
6813

Set parameter_page_big_endian to zero for bcmbca.

Update log level messages so that more critical messages can be logged
to console and help the troubleshooting with field devices.