i965: Increase BRW_MAX_UBO to 14.

i965: Increase BRW_MAX_UBO to 14.

The NVIDIA binary driver and Intel's closed source driver both expose
14 here, rather than the GL minimum of 12.  Let's follow suit.

Without this, Shadow of Mordor fails to render correctly and triggers
OpenGL errors:

Mesa: User error: GL_INVALID_VALUE in glBindBufferBase(index=68)
Mesa: User error: GL_INVALID_VALUE in glUniformBlockBinding(block binding 68 >= 60)

There are 5 stages (VS, TCS, TES, GS, FS), and 12 * 5 = 60 is too small.
14 * 5 = 70 will work just fine.

Tapani believes this will also help Alien Isolation.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Tapani Pälli <tapani.palli@intel.com>
Acked-by: Matt Turner <mattst88@gmail.com>