Vector extension test with floating point values

1. Add and change various template files to cover floating point number
instructions.
2. Generate vfadd test case using added and modified template files.
3. Test the generated test cases
3-1. Test "vadd" for back testing (to check our updated template files
work fine with previous test cases):
     m springbok && ctest --verbose -R ".*vadd.*"  --gtest_color=yes
3-2. Test "vfadd" with our template:
     m springbok && ctest --verbose -R ".*vfadd.*"  --gtest_color=yes
4. remove "sw/vec/tests/vector_vfadd_test.cpp"

Change-Id: Ieb97934994d815fbe2f0193abf274703a5ae4b3d
7 files changed