leds: turris-omnia: Remove unused local leds.h

This driver does not require any element from the local leds.h. Drop
unused header.

Signed-off-by: Javier Carrasco <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/leds/leds-turris-omnia.c

···
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
-#include "leds.h"
 
 #define OMNIA_BOARD_LEDS	12
 #define OMNIA_LED_NUM_CHANNELS	3