kbled: Check if using white or RGB keyboard

Use RGBKB-DET# to determine the type of keyboard connected.

If a white keyboard is attached, always set the color to white, and
always return white for the color.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/board/system76/common/kbled.c

@@ -3,6 +3,8 @@
 #include <board/kbled.h>
 #include <common/macro.h>
 
+enum KbledKind kbled_kind = KBLED_NONE;
+
 // clang-format off
 static uint8_t LEVEL_I = 1;
 static const uint8_t __code LEVELS[] = {