[PATCH] I2C: ds1337: search by bus number

Chip is searched by bus number rather than its own proprietary id.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>