NXP backend: Enable `split` support with new Neutron flow. (#20325) #9419

Job	Run time
test-qnn / test-backend-linux (qnn, models) / linux-job	27m 37s
test-qnn / test-backend-linux (qnn_16a4w, models) / linux-job	26m 10s
test-qnn / test-backend-linux (qnn_16a8w, models) / linux-job	27m 5s
test-qnn / test-backend-linux (qnn_8a8w, models) / linux-job	26m 16s
test-qnn / test-backend-linux (qnn_16a16w, operators) / linux-job	21m 17s
test-qnn / test-backend-linux (qnn_16a8w, operators) / linux-job	21m 8s
test-qnn / test-backend-linux (qnn_16a4w, operators) / linux-job	21m 25s
test-qnn / test-backend-linux (qnn_16a4w_block, models) / linux-job	27m 13s
test-qnn / test-backend-linux (qnn, operators) / linux-job	14m 52s
test-qnn / test-backend-linux (qnn_16a4w_block, operators) / linux-job	21m 11s
test-qnn / test-backend-linux (qnn_16a16w, models) / linux-job	30m 12s
test-qnn / test-backend-linux (qnn_8a8w, operators) / linux-job	20m 43s
test-qnn / test-backend-macos	-7s
test-qnn / package-golden-artifacts	5m 49s
	4h 50m 51s

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