can: sja1000_of_platform: fix build problems with printk format

According to "Documentation/printk-formats.txt", if the type is
dependent on a config option for its size, like resource_size_t,
we should use a format specifier of its largest possible type and
explicitly cast to it.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>