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Increase the spi-max-frequency from 20MHz to 52MHz for the SPI-NAND flash on the Mercusys MR90X v1. The underlying GigaDevice GD5F1GQ5UEYIGY SPI-NAND flash chip natively supports clock speeds up to 133MHz and the MediaTek MT7986B SoC handles 52MHz safely. Testing with 'dd' reading 16MB from /dev/mtd3 shows a significant performance improvement (~49% reduction in read time): Before (20MHz): 256+0 records in 256+0 records out real 0m 2.71s After (52MHz): 256+0 records in 256+0 records out real 0m 1.37s Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com> Link: https://github.com/openwrt/openwrt/pull/25246 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>