Driver Core: remove BUS_ID_SIZE

The name size limit is gone from the driver-core, this is
the removal of the last left-over.

Signed-off-by: Kay Sievers <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/device.h

···
 #include <asm/atomic.h>
 #include <asm/device.h>
 
-#define BUS_ID_SIZE		20
-
 struct device;
 struct device_private;
 struct device_driver;