[AMDGPU] Fix FMA combine (#119217)
Update the check in the FMA combine to check dot10-insts instead of
dot7-insts.
The target of the combine, v_dot2_f32_f16, is available only if
dot10-insts target feature is enabled.
The issue probably dates back to the change that split out dot10-insts
out of dot7-insts.
As far as I can see, this does not affect any current targets, but if a
future target has dot7-insts, but not dot10-insts that would cause a
crash ("cannot select") for the input ir in the test.
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