cc3200, teensy: Remove broken malloc/free/realloc macro helpers.

These macros are broken and are anyway unused on these two ports.  If they
are ever needed in the future then their implementation can be taken from
either stmhal (working macros in mpconfigport.h) or esp8266 (functions).

cc3200/mpconfigport.h

@@ -198,14 +198,6 @@ typedef long            mp_off_t;
 // disabling/enabling and sleep mode enter/exit
 #include "cc3200_asm.h"
 
-// There is no classical C heap in bare-metal ports, only Python
-// garbage-collected heap. For completeness, emulate C heap via
-// GC heap. Note that MicroPython core never uses malloc() and friends,
-// so these defines are mostly to help extension module writers.
-#define malloc                                      gc_alloc
-#define free                                        gc_free
-#define realloc                                     gc_realloc
-
 // We need to provide a declaration/definition of alloca()
 #include <alloca.h>
 

teensy/mpconfigport.h

@@ -100,14 +100,6 @@ __attribute__(( always_inline )) static inline mp_uint_t disable_irq(void) {
 #define MICROPY_BEGIN_ATOMIC_SECTION()     disable_irq()
 #define MICROPY_END_ATOMIC_SECTION(state)  enable_irq(state)
 
-// There is no classical C heap in bare-metal ports, only Python
-// garbage-collected heap. For completeness, emulate C heap via
-// GC heap. Note that MicroPython core never uses malloc() and friends,
-// so these defines are mostly to help extension module writers.
-#define malloc gc_alloc
-#define free gc_free
-#define realloc gc_realloc
-
 // We need to provide a declaration/definition of alloca()
 #include <alloca.h>