UDPEndPointImplLwIP: Support LWIP_TCPIP_CORE_LOCKING=0

Wrap calls to LwIP APIs in `tcpip_api_call()`, as required.
When `LWIP_TCPIP_CORE_LOCKING` is enabled, this internally becomes `LOCK_TCPIP_CORE/UNLOCK_TCPIP_CORE`
and when it isn't, it posts a message to the TCPIP task to run the function.

Added CHIP stack locking to the UDP receive function.

src/inet/EndPointStateLwIP.h

@@ -22,8 +22,9 @@
 
 #pragma once
 
-#include <inet/EndPointBasis.h>
+#include <functional>
 
+#include <inet/EndPointBasis.h>
 #include <inet/IPAddress.h>
 
 struct udp_pcb;
@@ -46,6 +47,10 @@ class DLL_EXPORT EndPointStateLwIP
         UDP     = 1,
         TCP     = 2
     } mLwIPEndPointType;
+
+    // Synchronously runs a function within the TCPIP task's context.
+    static void RunOnTCPIP(std::function<void()>);
+    static err_t RunOnTCPIPRet(std::function<err_t()>);
 };
 
 } // namespace Inet

src/inet/TCPEndPointImplLwIP.cpp

@@ -37,6 +37,13 @@
 #include <lwip/tcp.h>
 #include <lwip/tcpip.h>
 
+static_assert(LWIP_VERSION_MAJOR > 1, "CHIP requires LwIP 2.0 or later");
+
+#if !(CHIP_DEVICE_LAYER_TARGET_BL602 || CHIP_DEVICE_LAYER_TARGET_BL702 || CHIP_DEVICE_LAYER_TARGET_BL702L)
+// TODO: Update to use RunOnTCPIP.
+static_assert(LWIP_TCPIP_CORE_LOCKING, "CHIP requires config LWIP_TCPIP_CORE_LOCKING enabled");
+#endif
+
 namespace chip {
 namespace Inet {