intel/genxml: Handle field names with different spacing/hyphen

intel/genxml: Handle field names with different spacing/hyphen

If a field name differs slightly between two generations then this
change will still add the fields into the same group.

For example, these will be treated as equal:
* "Software Exception" and "Software  Exception"
* "Per Thread" and "Per-Thread"

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>