arm64: ftrace: Fix comment typo 'CONFIG_FUNCTION_GRAPH_FP_TEST'

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: a46ec3a14abfe0f56e262b580d1f56369c0fa6ae
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>