Only enable configSUPPORT_STATIC_ALLOCATION on BK72xx

RTL87xx loses 280 bytes heap with it enabled. BK72xx gains 712 bytes.
Keep it BK72xx-only where it's a clear win.

esphome/components/libretiny/__init__.py

@@ -438,13 +438,13 @@ async def component_to_code(config):
         # 4-8KB flash). Even if linked, it would use locks, so explicit FreeRTOS
         # mutexes are simpler and equivalent.
         cg.add_define(ThreadModel.MULTI_NO_ATOMICS)
-
-    # Enable FreeRTOS static allocation APIs (xQueueCreateStatic, etc.).
-    # Moves FreeRTOS internal structures (timer command queue) from heap to BSS,
-    # and allows FreeRTOSQueue to use xQueueCreateStatic on BK72xx.
-    # LibreTiny's FreeRTOSConfig.h doesn't define this, defaulting to 0.
-    # The -D wins over the #ifndef default in FreeRTOS.h.
-    cg.add_build_flag("-DconfigSUPPORT_STATIC_ALLOCATION=1")
+        # Enable FreeRTOS static allocation so FreeRTOSQueue can use
+        # xQueueCreateStatic (queue storage in BSS, no heap allocation).
+        # Also moves FreeRTOS internal structures (timer command queue) to BSS.
+        # BK72xx's FreeRTOSConfig.h doesn't define this, defaulting to 0.
+        # The -D wins over the #ifndef default in FreeRTOS.h.
+        # Not enabled on RTL87xx/LN882x — costs more heap than it saves there.
+        cg.add_build_flag("-DconfigSUPPORT_STATIC_ALLOCATION=1")
 
     # RTL8710B needs FreeRTOS 8.2.3+ for xTaskNotifyGive/ulTaskNotifyTake
     # required by AsyncTCP 3.4.3+ (https://github.com/esphome/esphome/issues/10220)

esphome/components/libretiny/freertos_static_alloc.c

@@ -10,7 +10,7 @@
  * allowing queue storage to live in BSS with zero runtime heap allocation.
  */
 
-#ifdef USE_LIBRETINY
+#ifdef USE_BK72XX
 
 #include <FreeRTOS.h>
 #include <task.h>
@@ -45,4 +45,4 @@ void vApplicationGetTimerTaskMemory(StaticTask_t **ppxTimerTaskTCBBuffer, StackT
 
 #endif /* configSUPPORT_STATIC_ALLOCATION */
 
-#endif /* USE_LIBRETINY */
+#endif /* USE_BK72XX */