Fix printk format warning by using %z for size_t modifier:

../drivers/bus/mhi/core/boot.c: In function `mhi_rddm_prepare':
../drivers/bus/mhi/core/boot.c:55:15: warning: format `%lx' expects argument of type `long unsigned int', but argument 5 has type `size_t {aka unsigned int}' [-Wformat=]
  dev_dbg(dev, "Address: %p and len: 0x%lx sequence: %u
",

Link: http://lkml.kernel.org/r/c4852a82-cdb9-6318-70a4-96ccb4ba5af2@infradead.org
Fixes: 6fdfdd27 ("bus: mhi: core: Add support for downloading RDDM image during panic")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Hemant Kumar <hemantk@codeaurora.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20200324022505.UiPPJZVXX%akpm@linux-foundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>