[esp32] Add option to disable libc locks in IRAM, saving ~1.3KB RAM (#10930)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

tests/components/esp32/test.esp32-idf.yaml

@@ -5,6 +5,7 @@ esp32:
     advanced:
       enable_lwip_mdns_queries: true
       enable_lwip_bridge_interface: true
+      disable_libc_locks_in_iram: false  # Test explicit opt-out of RAM optimization
 
 wifi:
   ssid: MySSID