support rv elu erf gelu selu

[futz12]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.29126% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.04%. Comparing base (7237643) to head (f7d79a2).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/layer/riscv/erf_riscv_zfh.cpp	50.00%	19 Missing ⚠️
src/layer/riscv/erf_riscv.cpp	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6608      +/-   ##
==========================================
- Coverage   93.41%   93.04%   -0.37%     
==========================================
  Files         868      875       +7     
  Lines      275540   273928    -1612     
==========================================
- Hits       257391   254887    -2504     
- Misses      18149    19041     +892     

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