optimize the realization of cuda dropout #19136
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dropout use thrust api to generate the random is too slow, use the curand can speed up
PaddlePaddle/benchmark#148
测试transformer-big（enable_ce）中dropout OP 的平均耗时：(利用PaddlePaddle的profiler工具）：
Ave Time : 1.16155 ----> 0.344537
transformer-big模型加速效果，性能提升约：10%
transformer-base模型加速效果，性能提升约：12%
CUDA实现修改之后无多卡随机性问题