add 3 operators ops (max_pool2d, linear, conv2d)in xnnPack test (#83131)
Summary: add 3 operators ops (max_pool2d, linear, conv2d) test functions in xnnPack test
Test Plan: buck test //xplat/caffe2:pt_xnnpack_test
Reviewed By: kirklandsign
Differential Revision: D38548757
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83131
Approved by: https://github.com/kirklandsign
