ftrace: Remove ftrace_regex_lseek()

This is a leftover after ftrace_regex_lseek() was renamed to
ftrace_filter_lseek() and then ftrace_filter_lseek() was moved
out side of CONFIG_DYNAMIC_FTRACE.

Link: http://lkml.kernel.org/r/51B1A1BD.40905@huawei.com



Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>