move isl_space_params into isl_parameter_alignment_reordering
All callers of isl_parameter_alignment_reordering were removing
dimensions other than the parameters, some using isl_space_params
and some by explicitly removing input and output dimensions.
Consistently use isl_space_params and do so inside
isl_parameter_alignment_reordering, the documentation of which
already suggests it only considers the parameters
in the "aligner" argument.
Signed-off-by: Sven Verdoolaege <sven.verdoolaege@gmail.com>