tests/avocado/linux_ssh_mips_malta.py: add missing accel (tcg) tag

Being explicit about the accelerator used on these tests is a good
thing in itself, but it will also be used in the filtering rules
applied on "make check-avocado".

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220225210156.2032055-6-crosa@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

tests/avocado/linux_ssh_mips_malta.py

@@ -23,6 +23,9 @@
 @skipUnless(os.getenv('AVOCADO_TIMEOUT_EXPECTED'), 'Test might timeout')
 @skipUnless(ssh.SSH_CLIENT_BINARY, 'No SSH client available')
 class LinuxSSH(QemuSystemTest, LinuxSSHMixIn):
+    """
+    :avocado: tags=accel:tcg
+    """
 
     timeout = 150 # Not for 'configure --enable-debug --enable-debug-tcg'