* default.cfg: Update to C5.

* default.cfg: Update to C5.
* current.cfg: Regenerate.
* lex.cfg.c: Regenerate.
* lex.cmodel.c: Regenerate.
* lex.gmap.c: Regenerate.
* mepcfgtool.c: Add C5 support.
(do_config_cc_support): Allow -mconfig to be optional.
(align_xmem_base): New.
(next_xmem_base): New.
(scan_dmem): Use them to place memory regions.
(find_ld_imem_dmem): Likewise.
* mepcfgtool.h: Add C5 support.
* parse.cfg.c: Regenerate.
* parse.cfg.h: Regenerate.
* parse.cmodel.c: Regenerate.
* parse.cmodel.h: Regenerate.
* parse.gmap.c: Regenerate.
* parse.gmap.h: Regenerate.
* verify-cfg.c: Add C5 support.