KVM: s390: Add P bit in table entry bitfields, move union vaddress

KVM: s390: Add P bit in table entry bitfields, move union vaddress

Add P bit in hardware definition of region 3 and segment table entries.

Move union vaddress from kvm/gaccess.c to asm/dat_bits.h

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>