Pass breakpoint type in set_breakpoint_at

Pass breakpoint type in set_breakpoint_at

Nowadays, set_breakpoint_at creates breakpoint of type
other_breakpoint, but we also use set_breakpoint_at
in set_reinsert_breakpoint to create breakpoint, so that
we have to overwrite the breakpoint type like this,

  bp = set_breakpoint_at (stop_at, NULL);
  bp->type = reinsert_breakpoint;

which looks not very good.  This patch changes set_breakpoint_at
to receive breakpoint type.  Since set_breakpoint_at is
used in many places, I rename it to set_breakpoint_type_at, and wrap
it with set_breakpoint_at, and pass other_breakpoint.  In this way,
we can call set_breakpoint_type_at with reinsert_breakpoint in
set_reinsert_breakpoint too, and code looks cleaner.

gdb/gdbserver:

2016-07-21  Yao Qi  <yao.qi@linaro.org>

	* mem-break.c (set_breakpoint_at): Rename it to ...
	(set_breakpoint_type_at): ... it.
	(set_breakpoint_at): Call set_breakpoint_type_at.
	(set_reinsert_breakpoint): Call set_breakpoint_type_at.
	* mem-break.h (set_breakpoint_at): Update comments.