tests/tcg/s390x: Add the floating-point multiply-and-add test

Add a test to prevent regressions.
Share some useful pieces with the vfminmax test.
Remove the duplicates from the floating point class

tests/tcg/s390x: Add the floating-point multiply-and-add test

Add a test to prevent regressions.
Share some useful pieces with the vfminmax test.
Remove the duplicates from the floating point class values.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20241023000147.34035-3-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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