NXP backend: Add Linear+BN fusion to conversion pipeline of unit test… #2974

Job	Run time
test-coreml / test-backend-macos (coreml, models) / macos-job	18m 52s
test-coreml / test-backend-macos (coreml_static_int8, models) / macos-job	31m 5s
test-coreml / test-backend-macos (coreml_static_int8, operators) / macos-job	2h 0m 43s
test-coreml / test-backend-macos (coreml, operators) / macos-job	16m 27s
test-coreml / test-backend-linux	-1s
test-coreml / package-golden-artifacts	0s
	3h 7m 6s

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