Remove 'kind' parameter from dw2_map_matching_symbols

Remove 'kind' parameter from dw2_map_matching_symbols

I noticed that dw2_map_matching_symbols does not use its 'kind'
parameter.  This patch removes it.  Tested by rebuilding.

2021-03-24  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (dw2_map_matching_symbols): Update.
	(dw2_expand_symtabs_matching_symbol): Remove 'kind' parameter.
	(check_match, dw2_expand_symtabs_matching)
	(dwarf2_debug_names_index::map_matching_symbols)
	(dwarf2_debug_names_index::expand_symtabs_matching): Update.