etnaviv: remove not used etna_bits_ones(..)

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>

src/gallium/drivers/etnaviv/etnaviv_util.h

@@ -40,12 +40,6 @@ etna_align_up(uint32_t value, uint32_t granularity)
    return (value + (granularity - 1)) & (~(granularity - 1));
 }
 
-static inline uint32_t
-etna_bits_ones(unsigned num)
-{
-   return (1 << num) - 1;
-}
-
 /* clamped float [0.0 .. 1.0] -> [0 .. 255] */
 static inline uint8_t
 etna_cfloat_to_uint8(float f)