heap: Fix compilation errors when CONFIG_HEAP_TLSF_USE_ROM_IMPL is set

- include headers from the tlsf submodule only when CONFIG_HEAP_TLSF_USE_ROM_IMPL is not set
- remove usage of the tlsf_t type in the multi_heap.c
- add missing declaration of tlsf_poison_fill_pfunc_set() in multi_heap_poisoning.c
- define headers from tlsf submodule as private
- update the linker file in the heap component to the new naming of the tlsf file
- update the copyright docuementation to reference the submodule in github (https://github.com/espressif/tlsf)
- remove deleted files from the check_copyright_ignore.txt

components/heap/multi_heap_poisoning.c

@@ -21,7 +21,15 @@
 /* Defines compile-time configuration macros */
 #include "multi_heap_config.h"
 
+#if !CONFIG_HEAP_TLSF_USE_ROM_IMPL
 #include "tlsf.h"
+#else
+/* Declaration of the tlsf_poison_fill_pfunc_set defined in RAM
+ * used to call IDF function multi_heap_internal_poison_fill_region()
+ * in this source file
+ */
+extern void tlsf_poison_fill_pfunc_set(void *pfunc);
+#endif
 
 #ifdef MULTI_HEAP_POISONING