Minor cleanup of RP2040 code post addition of Pico-PIO_USB

* Removed some compiler warnings, and cleaned out unnecessary warning suppression from CMake suppress_tinyusb_warnings()
* Made explicit family_configure_dual_usb_example() for DUAL mode examples as family_configure_target() may not generally be called multiple times for the same target

* Renamed library pico_pio_usb to tinyusb_picio_pio_usb to be clearer and avoid conflict if someone already has a pico_pio_usb in their project
* Added family_add_pico_pio_usb() method for adding Pico-PIO_SUB support to an existing example
* Allowed tinyusb_pico_pio_usb to be added to regular apps using the Pico SDK

src/portable/raspberrypi/rp2040/rp2040_usb.c

@@ -58,9 +58,9 @@ void rp2040_usb_init(void)
   unreset_block_wait(RESETS_RESET_USBCTRL_BITS);
 
   // Clear any previous state just in case
-  // TODO Suppress warning array-bounds with gcc11
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Warray-bounds"
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
   memset(usb_hw, 0, sizeof(*usb_hw));
   memset(usb_dpram, 0, sizeof(*usb_dpram));
 #pragma GCC diagnostic pop