boards: mcxn947_qspi: fix mcuboot partition allocation #1

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	2m 2s
environment (esp32, serialrecovery)	2m 21s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 35s
environment (esp32s2, serialrecovery)	2m 9s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 16s
environment (esp32s3, serialrecovery)	1m 38s
environment (esp32c3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 10s
environment (esp32c3, serialrecovery)	1m 56s
environment (esp32, multi-image,multi-boot, multi)	1m 30s
environment (esp32s3, multi-image,multi-boot, multi)	2m 24s
	21m 1s

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