[IA64] mbcs: fix printk format warnings

drivers/char/mbcs.c:719: warning: format '%lx' expects type 'long unsigned int', but argument 3 has type 'uint64_t'
drivers/char/mbcs.c:719: warning: format '%lx' expects type 'long unsigned int', but argument 4 has type 'uint64_t'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Bruce Losure <blosure@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>