extmod/modmachine: Clean up decls of machine types to use common ones.

The machine_i2c_type, machine_spi_type and machine_timer_type symbols are
already declared in extmod/modmachine.h and should not be declared anywhere
else.

Also move declarations of machine_pin_type and machine_rtc_type to the
common header in extmod.

Signed-off-by: Damien George <damien@micropython.org>

drivers/esp-hosted/esp_hosted_hal.c

@@ -34,9 +34,8 @@
 #include <string.h>
 
 #include "py/runtime.h"
-#include "modmachine.h"
 #include "extmod/machine_spi.h"
-#include "mpconfigboard.h"
+#include "extmod/modmachine.h"
 #ifdef MICROPY_HW_WIFI_LED
 #include "led.h"
 #endif