NXP backend: Add option to use the new Neutron flow. #2980

Job	Run time
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	16m 10s
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	20m 30s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	31m 29s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	32m 33s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	46s
	1h 41m 28s

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