i2c: fix i2c-ismt.c printk format warning

Fix printk format warning.  dma_addr_t can be 32-bit or 64-bit,
so cast it to long long for printing.  This also matches the
printk format specifier that is already used.

drivers/i2c/busses/i2c-ismt.c:532:3: warning: format '%llX' expects argument of type 'long long unsigned int', but argument 4 has type 'dma_addr_t' [-Wformat]

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Wolfram Sang <wolfram@the-dreams.de>