Merge branch 'u-boot-nand-20250918' of https://source.denx.de/u-boot/custodians/u...

CI: https://source.denx.de/u-boot/custodians/u-boot-nand-flash/-/pipelines/28408

This pull request enhances NAND and SPI flash support, primarily
focusing on the Airoha EN7523 platform. The Airoha SPI driver receives
a major update, adding DMA, dual/quad-wire modes, and a critical
workaround to prevent flash damage if the UART_TXD pin shorts to Ground.

New chips supported include FudanMicro FM25S01A SPI-NAND and several
Winbond SPI NOR devices. Fixes include correcting Kconfig dependencies,
updating the mtd benchmark command to use lldiv(), and addressing minor
bugs in the generic spi-mem and SPL NAND code.