driver-core: firmware_class: remove base.h header inclusion

base.h is used by base drivers for sharing internal structures.
Turns out firmware_class does not depend on it at all so remove it.

Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 6604fb3..0797748 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -19,7 +19,6 @@
 #include <linux/kthread.h>
 #include <linux/highmem.h>
 #include <linux/firmware.h>
-#include "base.h"
 
 #define to_dev(obj) container_of(obj, struct device, kobj)