Add new lines between SIO methods

The commit adds new lines between the SIO functions which at least for
me improves readability and is consistent with the other methods in the
trait.

embassy-rp/src/gpio.rs

@@ -190,12 +190,15 @@ pub(crate) mod sealed {
             };
             block.gpio(self.pin() as _)
         }
+
         fn sio_out(&self) -> pac::sio::Gpio {
             SIO.gpio_out(self.bank() as _)
         }
+
         fn sio_oe(&self) -> pac::sio::Gpio {
             SIO.gpio_oe(self.bank() as _)
         }
+
         fn sio_in(&self) -> Reg<u32, RW> {
             SIO.gpio_in(self.bank() as _)
         }