Removed unused kprobe1 sdt support.

Removed unused kprobe1 sdt support.

* sdt_types.h: Remove KPROBE1_TYPE define and kprobe1_type enum value.
* testsuite/sys/sdt.h: Ditto.
* tapsets.cxx (sdt_kprobe_var_expanding_visitor): Removed struct and its
  functions.
  (sdt_query::have_kprobe): Removed function.
  (sdt_query::handle_probe_entry): Removed kprobe1_type support.
  (sdt_query::iterate_over_probe_entries): Removed have_kprobe() code.
  (sdt_query::convert_probe): Ditto.
  (sdt_query::convert_location): Ditto.