ath79: mikrotik: enable ecc hamming algorithm for kernel 5.15

This algorithm has it's own symbol now.
Enable it to fix nand support

Signed-off-by: Koen Vandeputte <[email protected]>

target/linux/ath79/mikrotik/config-default

@@ -15,6 +15,7 @@ CONFIG_MTD_NAND=y
 CONFIG_MTD_NAND_AR934X=y
 CONFIG_MTD_NAND_CORE=y
 CONFIG_MTD_NAND_ECC=y
+CONFIG_MTD_NAND_ECC_SW_HAMMING=y
 CONFIG_MTD_NAND_RB4XX=y
 CONFIG_MTD_NAND_RB91X=y
 CONFIG_MTD_RAW_NAND=y