st/nine: Initialize ps ff registers
st/nine: Initialize ps ff registers

Found with wine tests for the rTmp register.
Not sure for the other ones.

Signed-off-by: Axel Davy <2b6ef604b998fb81662f85c329e4fc020eae8e5d@ens.fr>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler