[Fix](bangc-ops): fix focal_loss_sigmoid_backward gamma range precheck

[stulai]

Thanks for your contribution and we appreciate it a lot.

1. Motivation

fix focal_loss_sigmoid_backward gamma range precheck

2. Modification

modified:   kernels/focal_loss_sigmoid/focal_loss_sigmoid.cpp
modified:   mlu_op.h

3. Test Report

（1） gamma test
[2023-6-1 15:37:59] [MLUOP] [Error]:[mluOpFocalLossSigmoidBackward]: gamma should be in the range of [0, 10000]. But now gamma is 20000.
[2023-6-1 15:37:59] [MLUOP] [Error]:"MLUOP_STATUS_NOT_SUPPORTED in mluOpFocalLossSigmoidBackward( handle_, prefer, reduction, input_desc, input_mlu, target_desc, target_mlu, weight_desc, weight_mlu, alpha, gamma, grad_input_desc, grad_input_mlu)"

(2) release_temp cases test
[^ OK ] /MLU_OPS/SOFT_TRAIN/release_temp/focal_loss_sigmoid_backward/focal_loss_sigmoid_backward_data_included_int32_float16_1682494108948.pb
[ OK ] focal_loss_sigmoid_backward/TestSuite.mluOp/1029 (42 ms)
[----------] 1030 tests from focal_loss_sigmoid_backward/TestSuite (114205 ms total)

[----------] Global test environment tear-down
[2023-6-1 15:46:15] [MLUOP] [Vlog]:TearDown CNRT environment.
[ SUMMARY ] Total 1030 cases of 1 op(s).
ALL PASSED.
[==========] 1030 test cases from 1 test suite ran. (114730 ms total)
[ PASSED ] 1030 test cases.

YOU HAVE 7 DISABLED TESTS