boot: Add MCUBOOT_HW_KEY support for image encryption #1950

Job	Run time
config (RELEASE 2,4,6 SIGNATURE)	9m 13s
config (RELEASE 2,4,6 SIGNATURE LOW)	13m 23s
config (RELEASE 2,4,6 SIGNATURE MEDIUM)	17m 37s
config (RELEASE 8,10 SIGNATURE)	6m 41s
config (RELEASE 8,10 SIGNATURE LOW)	9m 37s
config (RELEASE 8,10 SIGNATURE MEDIUM)	12m 5s
config (MINSIZEREL 2,4,6 SIGNATURE)	15m 15s
config (MINSIZEREL 2,4,6 SIGNATURE LOW)	19m 49s
config (MINSIZEREL 2,4,6 SIGNATURE MEDIUM)	23m 51s
config (MINSIZEREL 8,10 SIGNATURE)	10m 38s
config (MINSIZEREL 8,10 SIGNATURE LOW)	13m 47s
config (MINSIZEREL 8,10 SIGNATURE MEDIUM)	16m 12s
	2h 48m 8s

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