fix: objtool: Rename frame.h -> objtool.h (v5.10)

fix: objtool: Rename frame.h -> objtool.h (v5.10)

See upstream commit :

  commit 00089c048eb4a8250325efb32a2724fd0da68cce
  Author: Julien Thierry <jthierry@redhat.com>
  Date:   Fri Sep 4 16:30:25 2020 +0100

    objtool: Rename frame.h -> objtool.h

    Header frame.h is getting more code annotations to help objtool analyze
    object files.

    Rename the file to objtool.h.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Ic2283161bebcbf1e33b72805eb4d2628f4ae3e89