arm64: switch compat to generic old sigsuspend

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c23afb1..8ae01ea 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -208,6 +208,7 @@
 	depends on !ARM64_64K_PAGES
 	select COMPAT_BINFMT_ELF
 	select HAVE_UID16
+	select OLD_SIGSUSPEND3
 	help
 	  This option enables support for a 32-bit EL0 running under a 64-bit
 	  kernel at EL1. AArch32-specific components such as system calls,