Merge branch 'u-boot-nand-03022026' of https://source.denx.de/u-boot/custodians/u...

CI: https://source.denx.de/u-boot/custodians/u-boot-nand-flash/-/pipelines/29183

This series provides a comprehensive cleanup of the Allwinner (sunxi)
NAND controller drivers and introduces full support for the H6 and H616
SoCs in both the main U-Boot driver and the SPL.

The series successfully deduplicates register maps between sunxi_nand.c
and sunxi_nand_spl.c while migrating to a capability-based architecture.
This approach allows the driver to handle the H616's specific
requirements—such as shifted register offsets for ECC/OOB, the removal
of 512B ECC block support, and mandatory MBUS clock gating—without
breaking compatibility for legacy A10/A23 devices.