NXP backend: Extend `unittest-nxp-neutron` job timeout to 120 minutes… #1353

Job	Run time
test-webgpu / test-backend-linux (webgpu, operators) / linux-job	46m 26s
test-webgpu / test-backend-linux (webgpu, models) / linux-job	27m 10s
test-webgpu / test-backend-macos	-1s
test-webgpu / package-golden-artifacts	1m 38s
	1h 15m 13s

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