dt-bindings: leds: adopt Linux PCA9532 binding constants

I'm working on a v2 patch to add support for a board named pdu001. Its
Linux DTS file uses the include file added by this patch. To keep Linux
and U-Boot DTS files in sync U-Boot requires a copy of this file,
although there is no driver for NXP's PCA9532 i2c LED driver chip (yet).
Signed-off-by: NFelix Brack <fb@ltec.ch>

include/dt-bindings/leds/leds-pca9532.h

+/*
+ * This header provides constants for pca9532 LED bindings.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _DT_BINDINGS_LEDS_PCA9532_H
+#define _DT_BINDINGS_LEDS_PCA9532_H
+
+#define PCA9532_TYPE_NONE         0
+#define PCA9532_TYPE_LED          1
+#define PCA9532_TYPE_N2100_BEEP   2
+#define PCA9532_TYPE_GPIO         3
+#define PCA9532_LED_TIMER2        4
+
+#endif /* _DT_BINDINGS_LEDS_PCA9532_H */