py/mpstate: Drop MICROPY_PORT_ROOT_POINTERS from mp_state_vm_t.

All in-tree uses of MICROPY_PORT_ROOT_POINTERS have been replaced with
MP_REGISTER_ROOT_POINTER(), so now we can remove both
MICROPY_PORT_ROOT_POINTERS and MICROPY_BOARD_ROOT_POINTERS from the code
and remaining config files.

Signed-off-by: David Lechner <david@pybricks.com>

ports/mimxrt/mpconfigport.h

@@ -237,14 +237,6 @@ extern const struct _mp_obj_type_t network_lan_type;
 
 #define MICROPY_HW_PIT_NUM_CHANNELS 3
 
-#ifndef MICROPY_BOARD_ROOT_POINTERS
-#define MICROPY_BOARD_ROOT_POINTERS
-#endif
-
-#define MICROPY_PORT_ROOT_POINTERS \
-    /* root pointers defined by a board */ \
-    MICROPY_BOARD_ROOT_POINTERS \
-
 #define MP_STATE_PORT MP_STATE_VM
 
 // Miscellaneous settings

ports/renesas-ra/mpconfigport.h

@@ -163,14 +163,6 @@
 
 #define MP_STATE_PORT MP_STATE_VM
 
-#ifndef MICROPY_BOARD_ROOT_POINTERS
-#define MICROPY_BOARD_ROOT_POINTERS
-#endif
-
-#define MICROPY_PORT_ROOT_POINTERS \
-    /* root pointers defined by a board */ \
-    MICROPY_BOARD_ROOT_POINTERS \
-
 // type definitions for the specific machine
 
 #define MICROPY_MAKE_POINTER_CALLABLE(p) ((void *)((uint32_t)(p) | 1))

ports/rp2/mpconfigport.h

@@ -204,13 +204,6 @@ extern const struct _mod_network_nic_type_t mod_network_nic_type_wiznet5k;
     MICROPY_HW_NIC_WIZNET5K \
     MICROPY_BOARD_NETWORK_INTERFACES \
 
-#ifndef MICROPY_BOARD_ROOT_POINTERS
-#define MICROPY_BOARD_ROOT_POINTERS
-#endif
-
-#define MICROPY_PORT_ROOT_POINTERS \
-    MICROPY_BOARD_ROOT_POINTERS \
-
 #define MP_STATE_PORT MP_STATE_VM
 
 // Miscellaneous settings

ports/stm32/mpconfigport.h

@@ -238,14 +238,6 @@ extern const struct _mod_network_nic_type_t mod_network_nic_type_cc3k;
 
 #define MP_STATE_PORT MP_STATE_VM
 
-#ifndef MICROPY_BOARD_ROOT_POINTERS
-#define MICROPY_BOARD_ROOT_POINTERS
-#endif
-
-#define MICROPY_PORT_ROOT_POINTERS \
-    /* root pointers defined by a board */ \
-        MICROPY_BOARD_ROOT_POINTERS \
-
 // type definitions for the specific machine
 
 #define MICROPY_MAKE_POINTER_CALLABLE(p) ((void *)((uint32_t)(p) | 1))

ports/unix/variants/minimal/mpconfigvariant.h

@@ -107,8 +107,6 @@
 #define MICROPY_PY_UHASHLIB         (0)
 #define MICROPY_PY_UBINASCII        (0)
 
-#define MICROPY_PORT_ROOT_POINTERS \
-
 #define mp_type_fileio mp_type_vfs_posix_fileio
 #define mp_type_textio mp_type_vfs_posix_textio
 

py/mpconfig.h

@@ -1659,11 +1659,6 @@ typedef double mp_float_t;
 #define MICROPY_PORT_CONSTANTS
 #endif
 
-// Any root pointers for GC scanning - see mpstate.c
-#ifndef MICROPY_PORT_ROOT_POINTERS
-#define MICROPY_PORT_ROOT_POINTERS
-#endif
-
 /*****************************************************************************/
 /* Hooks for a port to wrap functions with attributes                        */
 

py/mpstate.h

@@ -189,9 +189,6 @@ typedef struct _mp_state_vm_t {
     mp_obj_t track_reloc_code_list;
     #endif
 
-    // include any root pointers defined by a port
-    MICROPY_PORT_ROOT_POINTERS
-
     // Include any root pointers registered with MP_REGISTER_ROOT_POINTER().
     #ifndef NO_QSTR
     // Only include root pointer definitions when not doing qstr extraction, because