selftests: breakpoints: re-order TEST_GEN_PROGS targets

breakpoint_test can fail on arm64 with older/unpatched glibc:

 breakpoint_test_arm64.c: In function 'run_test':
 breakpoint_test_arm64.c:170:25: error: 'TRAP_HWBKPT' undeclared (first use
 in this function)

due to glibc missing several of the TRAP_* constants in the userspace
definitions. Specifically TRAP_BRANCH and TRAP_HWBKPT.
See https://sourceware.org/bugzilla/show_bug.cgi?id=21286

It prevents to build step_after_suspend_test afterward, since make won't
continue.

We still want to be able to build and run the test, independently of
breakpoint_test_arm64 build failure. Re-order TEST_GEN_PROGS to be able to
build step_after_suspend_test first.
Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/breakpoints/Makefile

@@ -2,14 +2,14 @@
 uname_M := $(shell uname -m 2>/dev/null || echo not)
 ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
+TEST_GEN_PROGS := step_after_suspend_test
+
 ifeq ($(ARCH),x86)
-TEST_GEN_PROGS := breakpoint_test
+TEST_GEN_PROGS += breakpoint_test
 endif
 ifneq (,$(filter $(ARCH),aarch64 arm64))
-TEST_GEN_PROGS := breakpoint_test_arm64
+TEST_GEN_PROGS += breakpoint_test_arm64
 endif
 
-TEST_GEN_PROGS += step_after_suspend_test
-
 include ../lib.mk