arm64: Add 'notrace' attribute to unwind_frame() for ftrace

walk_stackframe() calls unwind_frame(), and if walk_stackframe() is
"notrace", unwind_frame() should be also "notrace".

Change-Id: Ie4ad5346ff5ff47a0525ace9bd5f70deb18d5231
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 26e2ae39995469b9289aa1ec0144e256d56eb044
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git


Signed-off-by: Pratik Patel <pratikp@codeaurora.org>