glsl: pass UseSTD430AsDefaultPacking to where it will be used

Here we also make use of the UseSTD430AsDefaultPacking constant
and call the new get_internal_ifc_packing() helper.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/compiler/glsl/lower_buffer_access.h

@@ -58,6 +58,9 @@ public:
                             bool *row_major, int *matrix_columns,
                             const glsl_struct_field **struct_field,
                             enum glsl_interface_packing packing);
+
+protected:
+   bool use_std430_as_default;
 };
 
 } /* namespace lower_buffer_access */