Makefile: Fix typo in object list

Makefile: Fix typo in object list

The ONEWIRE_PARSER_OBJS was written incorrectly. This causes ALL_OBJS
list to miss the parser object, which in turn causes the dependency
file to be missing from the ALL_DEBS list. That was causing make to
not detect that onewire_parser.c depends on version.h, and not rebuild
the library when version.h was changed.

Signed-off-by: Timo Kokkonen <timo.t.kokkonen@iki.fi>