default or selected kernelversion does not have config value CONFIG_MTD_NAND_AT91_ECC_HW.
Result is shown for kernelversion 5.19-rc1

Hardware ECC

configname: CONFIG_MTD_NAND_AT91_ECC_HW

ECC management for NAND Flash / SmartMedia on AT91
└─>Hardware ECC
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
Uses hardware ECC provided by the at91sam9260/at91sam9263 chip
instead of software ECC.
The hardware ECC controller is capable of single bit error
correction and 2-bit random detection per page.

NB : hardware and software ECC schemes are incompatible.
If you switch from one to another, you'll have to erase your
mtd partition.

If unsure, say Y