rp2: Rename machine I2C type consistently across ports.

This renames:
- machine_hw_i2c_type -> machine_i2c_type

ports/rp2/machine_i2c.c

@@ -68,8 +68,8 @@ typedef struct _machine_i2c_obj_t {
 } machine_i2c_obj_t;
 
 STATIC machine_i2c_obj_t machine_i2c_obj[] = {
-    {{&machine_hw_i2c_type}, i2c0, 0, MICROPY_HW_I2C0_SCL, MICROPY_HW_I2C0_SDA, 0},
-    {{&machine_hw_i2c_type}, i2c1, 1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA, 0},
+    {{&machine_i2c_type}, i2c0, 0, MICROPY_HW_I2C0_SCL, MICROPY_HW_I2C0_SDA, 0},
+    {{&machine_i2c_type}, i2c1, 1, MICROPY_HW_I2C1_SCL, MICROPY_HW_I2C1_SDA, 0},
 };
 
 STATIC void machine_i2c_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
@@ -177,7 +177,7 @@ STATIC const mp_machine_i2c_p_t machine_i2c_p = {
 };
 
 MP_DEFINE_CONST_OBJ_TYPE(
-    machine_hw_i2c_type,
+    machine_i2c_type,
     MP_QSTR_I2C,
     MP_TYPE_FLAG_NONE,
     make_new, machine_i2c_make_new,

ports/rp2/modmachine.c

@@ -239,7 +239,7 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_mem32),               MP_ROM_PTR(&machine_mem32_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_ADC),                 MP_ROM_PTR(&machine_adc_type) },
-    { MP_ROM_QSTR(MP_QSTR_I2C),                 MP_ROM_PTR(&machine_hw_i2c_type) },
+    { MP_ROM_QSTR(MP_QSTR_I2C),                 MP_ROM_PTR(&machine_i2c_type) },
     { MP_ROM_QSTR(MP_QSTR_SoftI2C),             MP_ROM_PTR(&mp_machine_soft_i2c_type) },
     { MP_ROM_QSTR(MP_QSTR_I2S),                 MP_ROM_PTR(&machine_i2s_type) },
     { MP_ROM_QSTR(MP_QSTR_Pin),                 MP_ROM_PTR(&machine_pin_type) },

ports/rp2/modmachine.h

@@ -4,7 +4,7 @@
 #include "py/obj.h"
 
 extern const mp_obj_type_t machine_adc_type;
-extern const mp_obj_type_t machine_hw_i2c_type;
+extern const mp_obj_type_t machine_i2c_type;
 extern const mp_obj_type_t machine_i2s_type;
 extern const mp_obj_type_t machine_pin_type;
 extern const mp_obj_type_t machine_rtc_type;