Revert "boot: Add MCUBOOT_HW_KEY support for image encryption" #1891

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	2m 1s
environment (esp32, serialrecovery)	1m 36s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 48s
environment (esp32s2, serialrecovery)	1m 26s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 56s
environment (esp32s3, serialrecovery)	1m 26s
environment (esp32c3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 42s
environment (esp32c3, serialrecovery)	1m 26s
environment (esp32, multi-image,multi-boot, multi)	1m 33s
environment (esp32s3, multi-image,multi-boot, multi)	1m 33s
	16m 27s

Provide feedback