s390/cio: use bitwise types to allow for type checking

s390/cio: use bitwise types to allow for type checking

Change types of I/O structure members which contain physical addresses to
dma32_t and dma64_t bitwise types.

This allows to make use of sparse (aka "make C=1") to find incorrect usage
of physical addresses.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>