led: gpio: Use NOP uclass driver for top-level node

The top level DT node of gpio-leds is not a LED itself, bind NOP uclass
driver to it, and bind different LED uclass driver to its subnodes which
represent the actual LEDs. This simplifies the probe() implementation
and fixes the bogus top-level not-an-LED in 'led list' command output:

```
=> led list
led             Error -121 <--- This is removed/fixed by this patch
green:user0     off
```

Signed-off-by: Marek Vasut <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: Patrick Delaunay <[email protected]>
Cc: Sean Anderson <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Steven Lawrance <[email protected]>
Reviewed-by: Patrice Chotard <[email protected]>
Tested-by: Patrice Chotard <[email protected]>

0 files changed, 0 insertions, 0 deletions