staging: fsl-mc: fix formating of phys_addr_t on 32 bits

Use correct format specifier for phys_addr_t variables (%pa) instead
of %llx. This fixes these warnings on 32 bit targets:
 "format '%llx' expects argument of type 'long long unsigned int',
  but argument 4 has type 'phys_addr_t' [-Wformat=]"

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>