nvc0: reduce GL_MAX_3D_TEXTURE_SIZE to 2048 on Kepler+
nvc0: reduce GL_MAX_3D_TEXTURE_SIZE to 2048 on Kepler+

The blob sets it to 2048 and using 4096 reports an INVALID_DATA error
with RT_ARRAY_MODE when z is 4096. Suggested by Ilia Mirkin.

Signed-off-by: Samuel Pitoiset <506e97eed81d9e59d22f4c73fb51123bb62b4a30@gmail.com>
Reviewed-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>
Cc: "11.1 11.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler