Zephyr: Auto-export models from prj.conf #4453

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	14m 44s
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	24m 50s
test-xnnpack / test-backend-macos	0s
test-xnnpack / package-golden-artifacts	3m 44s
	43m 18s

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