tracing: Fix selftest config check for function graph start up test

There's a new test in trace_selftest_startup_function_graph() that
requires the use of ftrace args being supported as well does some tricks
with dynamic tracing. Although this code checks HAVE_DYNAMIC_FTRACE_WITH_ARGS
it fails to check DYNAMIC_FTRACE, and the kernel fails to build due to
that dependency.

Also only define the prototype of trace_direct_tramp() if it is used.

Link: https://lkml.kernel.org/r/[email protected]

Acked-by: Jiri Olsa <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

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