arm64: ftrace: fix build error with CONFIG_FUNCTION_GRAPH_TRACER=n

It appears that a merge conflict ended up hiding a newly added constant
in some configurations:

arch/arm64/kernel/entry-ftrace.S: Assembler messages:
arch/arm64/kernel/entry-ftrace.S:59: Error: undefined symbol FTRACE_OPS_DIRECT_CALL used as an immediate value

FTRACE_OPS_DIRECT_CALL is still used when CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
is enabled, even if CONFIG_FUNCTION_GRAPH_TRACER is disabled, so change the
ifdef accordingly.

Link: https://lkml.kernel.org/r/20230623152204.2216297-1-arnd@kernel.org

Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Donglin Peng <pengdonglin@sangfor.com.cn>
Fixes: 3646970322 ("arm64: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Florent Revest <revest@chromium.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

arch/arm64/kernel/asm-offsets.c

@@ -213,9 +213,9 @@ int main(void)
   DEFINE(FGRET_REGS_X7,			offsetof(struct fgraph_ret_regs, regs[7]));
   DEFINE(FGRET_REGS_FP,			offsetof(struct fgraph_ret_regs, fp));
   DEFINE(FGRET_REGS_SIZE,		sizeof(struct fgraph_ret_regs));
+#endif
 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
   DEFINE(FTRACE_OPS_DIRECT_CALL,	offsetof(struct ftrace_ops, direct_call));
-#endif
 #endif
   return 0;
 }