NNAPI VTS: use max time point instead of uint64_t max

Bug: 149441015
Test: mma
Test: VtsHalNeuralnetworksV1_3TargetTest
Change-Id: Ic74f83242cbe04a4cec47adbfc51002fdf8bb47d
Merged-In: Ic74f83242cbe04a4cec47adbfc51002fdf8bb47d
(cherry picked from commit 79d6bb1ad23bfee4922d7c216ce8fbaed6d0dece)
1 file changed