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The underlying issue is that gcc 4.8 doesn't define __ARM_NEON (4.9 does), so the check in https://github.com/opencv/opencv/blob/3.4/cmake/checks/cpu_neon.cpp#L7 fails. I tried to remove this but then ran into other issues (undefined macro UINT64_C in the arm_neon.h header of my toolchain).
I strongly recommend to update your toolchain if at all possible. For the Nvidia boards you should be able to use the toolchain provided by Linaro at https://www.linaro.org/downloads/
