nvc0: Skip new update barrier bits

nvc0: Skip new update barrier bits

I added new barrier bits in 220c1dce1e3194ea867e6d948fc7ff5b9ef2d3a7
and made most drivers skip them.  I thought nvc0 was already skipping
those but missed the else case here, which does something.  So make it
explicitly skip like I did everywhere else.

Thanks to Ilia for catching this.

Fixes: 220c1dce1e3 gallium: Add PIPE_BARRIER_UPDATE_BUFFER and UPDATE_TEXTURE bits.