Introduce ARCH_HAVE_EXTRA_HEAPS, this config is going to be used for

chips that have multiple separate heaps.
For now it's used to enable APIs to initialize the different heaps
during the start sequence but can be extended for other purposes that
manage those heaps.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>

sched/init/nx_start.c

@@ -572,8 +572,10 @@ void nx_start(void)
     }
 #endif
 
-#ifdef CONFIG_ARCH_USE_TEXT_HEAP
-  up_textheap_init();
+#ifdef CONFIG_ARCH_HAVE_EXTRA_HEAPS
+  /* Initialize any extra heap. */
+
+  up_extraheaps_init();
 #endif
 
 #ifdef CONFIG_MM_IOB