Add cmake flag for iot creds (#2056) #2338

Job	Run time
mac-os-build-clang	37m 26s
clang-format-check	17s
address-sanitizer	29m 49s
mac-os-m1-build-clang	26m 55s
mac-os-build-gcc	37m 20s
static-build-mac	34m 50s
undefined-behavior-sanitizer	30m 50s
arm32-cross-compilation	5m 9s
arm64-cross-compilation	5m 9s
linux-aarch64-cross-compilation	5m 9s
linux-gcc-4_4	18m 37s
mbedtls-ubuntu-clang	28m 31s
mbedtls-ubuntu-gcc	28m 38s
mbedtls-ubuntu-gcc-11	25m 20s
mbedtls-ubuntu-gcc-4_4-build	2m 44s
sample-check	4m 49s
sample-check-no-data-channel	5m 0s
static-build-linux	18m 23s
thread-sanitizer	30m 13s
ubuntu-os-build	30m 19s
windows-msvc-openssl	26m 28s
	7h 11m 56s

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