[rp] put PIO to GPIO at hal matrix

Author: andryblack

tools/scripts/generate_hal_matrix.py

@@ -106,7 +106,8 @@ def hal_get_modules():
                 "flash": "Internal Flash",
                 "timer": "Timer",
                 "i2c": "I<sup>2</sup>C",
-                "usart": "UART"
+                "usart": "UART",
+                "pio": "GPIO"
             }
             mname = remap.get(mname, mname.upper())
             modules.add(mname)