bootutil: Store image encrypted in scratch area #1814

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	1m 52s
environment (esp32, serialrecovery)	1m 31s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 1s
environment (esp32s2, serialrecovery)	1m 27s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 44s
environment (esp32s3, serialrecovery)	1m 38s
environment (esp32c3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 42s
environment (esp32c3, serialrecovery)	1m 51s
environment (esp32, multi-image,multi-boot, multi)	1m 26s
environment (esp32s3, multi-image,multi-boot, multi)	1m 38s
	16m 50s

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