arm64: entry-ftrace.S: Fix missing argument for CONFIG_FUNCTION_GRAPH_TRACER=y

Missing argument of another SYM_INNER_LABEL() breaks build for
CONFIG_FUNCTION_GRAPH_TRACER=y.

Fixes: e2d591d2 ("arm64: entry-ftrace.S: Convert to modern annotations for assembly functions")
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Brown <broonie@kernel.org>