nouveau: nv30: it may have 8 texture samplers (not 4), but shader engine has 16 texture units
nouveau: nv30: it may have 8 texture samplers (not 4), but shader engine has 16 texture units

Signed-off-by: Patrice Mandin <9f5c8487eabbbb43887584be91bf260482f7f315@gmail.com>

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