This resolves a number of warnings such as the below when building with
64-bit dma_addr_t on arm:

drivers/dma/ipu/ipu_idmac.c:1235:2: warning: format '%x' expects argument
  of type 'unsigned int', but argument 5 has type 'dma_addr_t' [-Wformat=]

..by upcasting to u64 and using %llx.
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>