pico sdk: add pio

Author: Bixilon

builder/frameworks/picosdk.py

@@ -338,6 +338,7 @@ def configure_printf_impl():
     ("hardware_spi", "+<*>"),
     ("hardware_dma", "+<*>"),
     ("hardware_i2c", "+<*>"),
+    ("hardware_pio", "+<*>"),
     ("hardware_ticks", "+<*>"),
     ("hardware_timer", "+<*>"),
     ("hardware_uart", "+<*>"),