Seed urandom with TRNG

pycardium/mpconfigport.h

@@ -30,6 +30,8 @@
 #define MICROPY_PY_UJSON                    (1)
 #define MICROPY_PY_URANDOM                  (1)
 #define MICROPY_PY_URANDOM_EXTRA_FUNCS      (1)
+#include "mphalport.h"
+#define MICROPY_PY_URANDOM_SEED_INIT_FUNC   (mp_hal_trng_read_int())
 #define MICROPY_PY_URE                      (1)
 #define MICROPY_PY_URE_MATCH_GROUPS         (1)
 #define MICROPY_PY_URE_MATCH_SPAN_START_END (1)