glsl: set matrix_stride for non matrices with atomic counter buffers

glsl: set matrix_stride for non matrices with atomic counter buffers

Patch sets matrix_stride as 0 for non matrix uniforms that are in a
atomic counter buffer. Matrix stride calculation for actual matrix
uniforms is done during link_assign_uniform_locations.

From ARB_program_interface_query specification:

GL_MATRIX_STRIDE:

   "For active variables not declared as a matrix or array of matrices,
   zero is written to <params>.  For active variables not backed by a
   buffer object, -1 is written to <params>, regardless of the variable
   type."

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Marta Lofstedt <marta.lofstedt@intel.com>