examples: Set LED GPIO function (#61)

Set the pin function to SIO instead of null (default).

examples/blinky_core1.zig

@@ -18,6 +18,7 @@ fn core1() void {
 }
 
 pub fn main() !void {
+    led.set_function(.sio);
     led.set_direction(.out);
     multicore.launch_core1(core1);
 

examples/flash_program.zig

@@ -28,6 +28,7 @@ pub const std_options = struct {
 };
 
 pub fn main() !void {
+    led.set_function(.sio);
     led.set_direction(.out);
     led.put(1);
 

examples/random.zig

@@ -28,6 +28,7 @@ pub const std_options = struct {
 };
 
 pub fn main() !void {
+    led.set_function(.sio);
     led.set_direction(.out);
     led.put(1);
 

examples/uart.zig

@@ -24,6 +24,7 @@ pub const std_options = struct {
 };
 
 pub fn main() !void {
+    led.set_function(.sio);
     led.set_direction(.out);
     led.put(1);
 

examples/usb_device.zig

@@ -138,6 +138,7 @@ pub const std_options = struct {
 };
 
 pub fn main() !void {
+    led.set_function(.sio);
     led.set_direction(.out);
     led.put(1);
 

examples/usb_hid.zig

@@ -153,6 +153,7 @@ pub const std_options = struct {
 };
 
 pub fn main() !void {
+    led.set_function(.sio);
     led.set_direction(.out);
     led.put(1);