[Silabs] Add build flag for subscription handler (project-chip#25020)

* add subscription handler build flag

* reduce default sleep time

examples/platform/silabs/efr32/BUILD.gn

@@ -41,6 +41,9 @@ declare_args() {
 
   #default Wifi Password
   chip_default_wifi_psk = ""
+
+  # Use default handler to negotiate subscription max interval
+  chip_config_use_icd_subscription_callbacks = enable_sleepy_device
 }
 
 silabs_common_plat_dir = "${chip_root}/examples/platform/silabs"
@@ -321,6 +324,10 @@ source_set("efr32-common") {
     public_deps += [ ":efr32-factory-data-provider" ]
   }
 
+  if (chip_config_use_icd_subscription_callbacks) {
+    public_deps += [ ":efr32-ICD-subscription-callback" ]
+  }
+
   public_deps += [
     "${chip_root}/examples/providers:device_info_provider",
     "${chip_root}/src/lib",

third_party/silabs/efr32_sdk.gni

@@ -38,7 +38,7 @@ declare_args() {
   # Enable Segger System View
   use_system_view = false
 
-  sleep_time_ms = 3300000  # 55 mins sleep
+  sleep_time_ms = 30000  # 30 seconds sleep
 
   silabs_log_enabled = true