nvc0: fix bindless multisampled images on Maxwell+

nvc0: fix bindless multisampled images on Maxwell+

NVC0_CB_AUX_BINDLESS_INFO isn't written to on Maxwell+ and it's too small
anyway.

With these changes, TXQ is used to determine the number of samples and
the coordinate adjustment information looked up in a small array in the
driver constant buffer.

v2: rework to use TXQ and a small array instead of a larger array with an
    entry for each texture
v3: get rid of the small array and calculate the adjustments in the shader

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Fixes: c2ae9b40527 ('nvc0: implement multisampled images on Maxwell+')
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>