[AutoTVM][TOPI] AutoTVM support for NHWC con2d#3858

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tmoreau89 wants to merge 3 commits intoapache:masterfrom

tmoreau89:conv2d_nhwc

Commits on Sep 2, 2019

accept NHWC format when registering tasks
Thierry Moreau
committed
initial conv2d_nhwc declaration and schedules
Thierry Moreau
committed
using spatial pack declaration/template from ARM
Thierry Moreau
committed