boot: Add MCUBOOT_HW_KEY support for image encryption #1845

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	1m 49s
environment (esp32, serialrecovery)	1m 27s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 54s
environment (esp32s2, serialrecovery)	1m 22s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 1s
environment (esp32s3, serialrecovery)	1m 25s
environment (esp32c3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 43s
environment (esp32c3, serialrecovery)	1m 29s
environment (esp32, multi-image,multi-boot, multi)	1m 32s
environment (esp32s3, multi-image,multi-boot, multi)	1m 30s
	16m 12s

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