[1/2] wined3d: Fix WINED3DTOP_MULTIPLYADD for ATI cards

[H. Verbeet]

The texop tests revealed WINED3DTOP_MULTIPLYADD was broken for ATI
cards as well. This is the ATI equivalent of
8e6c7aaf1fe6d99f3bfee4b4752da318c000486f.

Changelog:
  - Fix WINED3DTOP_MULTIPLYADD for ATI cards
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