py/obj: Add "full" and "empty" non-variable-length mp_obj_type_t.

This will always have the maximum/minimum size of a mp_obj_type_t
representation and can be used as a member in other structs.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

examples/natmod/btree/btree_c.c

@@ -94,7 +94,7 @@ int mp_stream_posix_fsync(void *stream) {
     return res;
 }
 
-mp_obj_type_t btree_type;
+mp_obj_full_type_t btree_type;
 
 #include "extmod/modbtree.c"
 

examples/natmod/framebuf/framebuf.c

@@ -8,7 +8,7 @@ void *memset(void *s, int c, size_t n) {
 }
 #endif
 
-mp_obj_type_t mp_type_framebuf;
+mp_obj_full_type_t mp_type_framebuf;
 
 #include "extmod/modframebuf.c"
 

examples/natmod/ure/ure.c

@@ -32,8 +32,8 @@ void *memmove(void *dest, const void *src, size_t n) {
     return mp_fun_table.memmove_(dest, src, n);
 }
 
-mp_obj_type_t match_type;
-mp_obj_type_t re_type;
+mp_obj_full_type_t match_type;
+mp_obj_full_type_t re_type;
 
 #include "extmod/modure.c"
 

examples/natmod/uzlib/uzlib.c

@@ -8,7 +8,7 @@ void *memset(void *s, int c, size_t n) {
 }
 #endif
 
-mp_obj_type_t decompio_type;
+mp_obj_full_type_t decompio_type;
 
 #include "extmod/moduzlib.c"