mimxrt,stm32: Enable MICROPY_PY_USSL_FINALISER.

This is needed because these ports allocate mbedtls data on the MicroPython
heap, and SSL socket objects must be fully cleaned up when they are garbage
collected, to free this memory allocated by mbedtls.  As part of this,
gc_sweep_all() will now ensure that the MP_STATE_PORT(mbedtls_memory)
linked-list is fully deallocated on soft reset.
Signed-off-by: Damien George <damien@micropython.org>

ports/mimxrt/mpconfigport.h

@@ -116,6 +116,7 @@ uint32_t trng_random_u32(void);
 #define MICROPY_PY_URE_MATCH_GROUPS         (1)
 #define MICROPY_PY_URE_MATCH_SPAN_START_END (1)
 #define MICROPY_PY_URE_SUB                  (1)
+#define MICROPY_PY_USSL_FINALISER           (MICROPY_PY_USSL)
 #define MICROPY_PY_UHASHLIB                 (1)
 #define MICROPY_PY_UBINASCII                (1)
 #define MICROPY_PY_UBINASCII_CRC32          (1)

ports/stm32/mpconfigport.h

@@ -91,6 +91,7 @@
 #endif
 
 // extended modules
+#define MICROPY_PY_USSL_FINALISER   (MICROPY_PY_USSL)
 #define MICROPY_PY_UHASHLIB_MD5     (MICROPY_PY_USSL)
 #define MICROPY_PY_UHASHLIB_SHA1    (MICROPY_PY_USSL)
 #define MICROPY_PY_UCRYPTOLIB       (MICROPY_PY_USSL)