block: skd: Use %pad printk format for dma_addr_t values

Use the existing %pad printk format to print dma_addr_t values.
This avoids the following warnings when compiling on the parisc64 platform:

drivers/block/skd_main.c: In function 'skd_preop_sg_list':
drivers/block/skd_main.c:660:4: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 6 has type 'dma_addr_t {aka unsigned int}' [-Wformat=]

Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>