configs: at91: Fix wrong definitions for CONFIG_PMECC_CAP

When CONFIG_ATMEL_NAND_HW_PMECC is set, CONFIG_PMECC_CAP defaults
to the value of 2. At the conversion to Kconfig for the PMECC config
values, some boards/defconfigs were wrongly configured.
Update CONFIG_PMECC_CAP to the PMECC_CAP value before the conversion.

Fixes: 49ad40298c ("ARM: at91: Convert SPL_GENERATE_ATMEL_PMECC_HEADER to Kconfig")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
diff --git a/configs/sama5d4ek_mmc_defconfig b/configs/sama5d4ek_mmc_defconfig
index 9c9862c..3aa1fd4 100644
--- a/configs/sama5d4ek_mmc_defconfig
+++ b/configs/sama5d4ek_mmc_defconfig
@@ -62,6 +62,7 @@
 CONFIG_MTD_RAW_NAND=y
 CONFIG_NAND_ATMEL=y
 CONFIG_ATMEL_NAND_HW_PMECC=y
+CONFIG_PMECC_CAP=8
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=30000000
 CONFIG_SPI_FLASH_ATMEL=y