the op flatten_contiguous_range and greater_than has supported amp mode since paddle 2.4

This reverts commit 6bed0f57.

This reverts commit 284e2a67.

This reverts commit a38e42f6.

This reverts commit 5a6fe171.

This reverts commit d3941dc1.

This reverts commit 32593b63.

This reverts commit d3374e89.

This reverts commit 9beb154b.

This reverts commit 392b75b1.

This reverts commit 9e683d0d.

This reverts commit 2a61ac65.

1. rm engine.device and use paddle.device.get_device() instead;
2. mv some code to build_train_func or build_eval_func to simpfy engine.