boot: zephyr: add ESP32-C6 support #1830

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	1m 52s
environment (esp32, serialrecovery)	1m 29s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 46s
environment (esp32s2, serialrecovery)	1m 26s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	1m 43s
environment (esp32s3, serialrecovery)	1m 24s
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 38s
environment (esp32s3, multi-image,multi-boot, multi)	1m 27s
	15m 57s

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