kselftest: Enable vDSO test on non x86 platforms

Currently the vDSO tests are built only on x86 platforms and cannot be
cross compiled.

Enable vDSO TARGET for all the platforms.

Future patches will extend the tests.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: fvincenzo

tools/testing/selftests/Makefile

@@ -65,6 +65,7 @@ endif
 TARGETS += tmpfs
 TARGETS += tpm2
 TARGETS += user
+TARGETS += vDSO
 TARGETS += vm
 TARGETS += x86
 TARGETS += zram

tools/testing/selftests/vDSO/Makefile

@@ -9,7 +9,6 @@ ifeq ($(ARCH),x86)
 TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
 endif
 
-ifndef CROSS_COMPILE
 CFLAGS := -std=gnu99
 CFLAGS_vdso_standalone_test_x86 := -nostdlib -fno-asynchronous-unwind-tables -fno-stack-protector
 ifeq ($(CONFIG_X86_32),y)
@@ -24,4 +23,3 @@ $(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
 		vdso_standalone_test_x86.c parse_vdso.c \
 		-o $@
 
-endif