Increase GCUTIMEOUT value for nokia-armhf platforms (sonic-net#17420)

Summary:
generic_config_updater/test_dynamic_acl.py::test_gcu_acl_scale_rules testcase fails for nokia-armhf platforms as it requires longer timer to scale acl rules due to the limited CPU computing power of ARM32 CPU.
So , increased the GCUTIMEOUT value to wait for applying the patch to 1200 seconds.

What is the motivation for this PR?
Fix failure of test_gcu_acl_scale_rules test by increasing timeout for apply-patch for nokia-armhf platforms

How did you do it?
Added platform specific check and modification of value for nokia-armhf platforms

How did you verify/test it?
Run generic_config_updater/test_dynamic_acl.py::test_gcu_acl_scale_rules on M0 topo on nokia-armhf platforms

Author: harish-kalyanaraman

tests/common/gu_utils.py

@@ -15,7 +15,7 @@
 DEFAULT_CHECKPOINT_NAME = "test"
 GCU_FIELD_OPERATION_CONF_FILE = "gcu_field_operation_validators.conf.json"
 GET_HWSKU_CMD = "sonic-cfggen -d -v DEVICE_METADATA.localhost.hwsku"
-GCUTIMEOUT = 600
+GCUTIMEOUT_MAP = {'armhf-nokia_ixs7215_52x-r0': 1200}
 
 BASE_DIR = os.path.dirname(os.path.realpath(__file__))
 FILES_DIR = os.path.join(BASE_DIR, "files")
@@ -125,7 +125,8 @@ def apply_patch(duthost, json_data, dest_file):
     start_time = time.time()
     output = duthost.shell(cmds, module_ignore_errors=True)
     elapsed_time = time.time() - start_time
-    if elapsed_time > GCUTIMEOUT:
+    gcu_timeout = get_gcu_timeout(duthost)
+    if elapsed_time > gcu_timeout:
         logger.error("Command took too long: {} seconds".format(elapsed_time))
         raise TimeoutError("Command execution timeout: {} seconds".format(elapsed_time))
 
@@ -576,3 +577,7 @@ def get_bgp_speaker_runningconfig(duthost):
     bgp_speaker_pattern = r"\s+neighbor.*update-source.*|\s+bgp listen range.*"
     bgp_speaker_config = re.findall(bgp_speaker_pattern, output['stdout'])
     return bgp_speaker_config
+
+
+def get_gcu_timeout(duthost):
+    return GCUTIMEOUT_MAP.get(duthost.facts['platform'], 600)