test_target.py: Allow specifying connection timeout for Android targets

Default connection timeout (30 secs) may be insufficient for some test
setups or in some conditions. Thus, support specifying timeout parameter
in target configuration file.

Signed-off-by: Metin Kaya <metin.kaya@arm.com>

tests/target_configs.yaml.example

@@ -1,5 +1,6 @@
 AndroidTarget:
   entry-0:
+    timeout: 60
     connection_settings:
       device: 'emulator-5554'
 

tests/test_target.py

@@ -41,9 +41,11 @@ def build_targets():
         for entry in target_configs['AndroidTarget'].values():
             pp(entry)
             a_target = AndroidTarget(
+                connect=False,
                 connection_settings=entry['connection_settings'],
                 conn_cls=lambda **kwargs: AdbConnection(adb_as_root=True, **kwargs),
             )
+            a_target.connect(timeout=entry.get('timeout', 60))
             targets.append((a_target, None))
 
     if target_configs.get('LinuxTarget') is not None: