support/testing: provide entropy to lua tests

Newer versions of lua-http require entropy.
Switch to use armv5 builtin kernel that already provides entropy for all
lua tests.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/269139374
https://gitlab.com/buildroot.org/buildroot/-/jobs/269139376

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Francois Perrad <francois.perrad@gadz.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/test_lua.py

@@ -12,7 +12,7 @@ class TestLuaBase(infra.basetest.BRTest):
 
     def login(self):
         cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
-        self.emulator.boot(arch="armv7",
+        self.emulator.boot(arch="armv5",
                            kernel="builtin",
                            options=["-initrd", cpio_file])
         self.emulator.login()