sdk: fix building external modules when CONFIG_STACK_VALIDATION=y

sdk: fix building external modules when CONFIG_STACK_VALIDATION=y

The option is at the moment enabled for x86/64.  The selection chain
should be

	config RETPOLINE
	  select STACK_VALIDATION if HAVE_STACK_VALIDATION
	config x86
	  select HAVE_STACK_VALIDATION            if X86_64

cryptdev-linux:

	make[4]: Entering directory '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/cryptodev-linux-cryptodev-linux-1.10'
	make -C /store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/linux-4.14.113 M=/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/cryptodev-linux-cryptodev-linux-1.10 ARCH=x86 CROSS_COMPILE=x86_64-openwrt-linux-musl- modules
	make[5]: Entering directory '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/linux-4.14.113'
	make[6]: *** No rule to make target '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/cryptodev-linux-cryptodev-linux-1.10/ioctl.o', needed by '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/cryptodev-linux-cryptodev-linux-1.10/cryptodev.o'.  Stop.
	Makefile:1533: recipe for target '_module_/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/cryptodev-linux-cryptodev-linux-1.10' failed

Open vSwitch intree kmods

	make[7]: Entering directory '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/openvswitch-2.11.0/datapath/linux'
	make -C /store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/linux-4.14.111 ARCH=x86 M=/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/openvswitch-2.11.0/datapath/linux modules
	make[8]: Entering directory '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/linux-4.14.111'
	make[9]: *** No rule to make target 'tools/objtool/objtool', needed by '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/openvswitch-2.11.0/datapath/linux/actions.o'.  Stop.
	Makefile:1533: recipe for target '_module_/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/openvswitch-2.11.0/datapath/linux' failed
	make[8]: *** [_module_/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/openvswitch-2.11.0/datapath/linux] Error 2
	make[8]: Leaving directory '/store/buildbot/slave/x86_64/build/sdk/build_dir/target-x86_64_musl/linux-x86_64/linux-4.14.111'

Reference: builddeb: include objtool binary in headers package, https://patchwork.kernel.org/patch/9014071/
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>