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: NLuis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>