fix some bugs in fpga V2 track

fix bugs for FPGA v2 track

Fix bug for FPGA track

Fix undefined symbol for ios arm v8

add fusion fc int8_t op and its UT.

imp dropout op kernel for gpu

Add pooling int8

add deconv for FPGA V1

imp resnet and squeezenet

This reverts commit 0a6079cc.

Fix ios cross compile, revert quantize kernel, and add other dequantize fusion pattern

Use user mode driver for FPGA track close #1325