rockchip: Change keyboard input from CrOS EC keyboard to a USB keyboard

These boards aren't ChromeOS devices so won't have a cros-ec-keyb
input as it's the keyboard available via the ChromeOS Embedded
Controller. Update them to use a USB keyboard which would actually
be available. Also enable the usb keyboard option for those devices
that don't have it enabled already.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/include/configs/tinker_rk3288.h b/include/configs/tinker_rk3288.h
index f1095cc..d239e3b 100644
--- a/include/configs/tinker_rk3288.h
+++ b/include/configs/tinker_rk3288.h
@@ -7,7 +7,7 @@
 #define __CONFIG_H
 
 #define ROCKCHIP_DEVICE_SETTINGS \
-		"stdin=serial,cros-ec-keyb\0" \
+		"stdin=serial,usbkbd\0" \
 		"stdout=serial,vidconsole\0" \
 		"stderr=serial,vidconsole\0"