rp/pio: allow wrap-around program loading

execution wraps around after the end of instruction memory and wrapping
works with this, so we may as well allow program loading across this
boundary. could be useful for reusing chunks of instruction memory.

examples/rp/src/bin/pio_hd44780.rs

@@ -95,6 +95,7 @@ impl<'l> HD44780<'l> {
         let prg = pio_proc::pio_asm!(
             r#"
                 .side_set 1 opt
+                .origin 20
 
                 loop:
                     out x,     24
@@ -148,7 +149,7 @@ impl<'l> HD44780<'l> {
         // many side sets are only there to free up a delay bit!
         let prg = pio_proc::pio_asm!(
             r#"
-                .origin 7
+                .origin 27
                 .side_set 1
 
                 .wrap_target