support/testing: test_luvi: switch to armv5 to boot with rng support enabled

Since the commit replacing moonjit by luajit [1] luvi doesn't work without
rng support enabled.

Switch to armv5 to use virtio-rng-pci on the qemu command line [2].

[1] 9450b53c8e06f1b5a75840b82c0f4663a5d75c45
[2] https://git.buildroot.net/buildroot/tree/support/testing/infra/emulator.py?h=2021.08.1

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/testing/tests/package/test_luvi.py

@@ -17,7 +17,7 @@ class TestLuvi(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()