PAX ASLR: increase default settings on AMD64 platfrom

Signed-off-by: Oliver Pinter <op@freebsd.org>
PAX ASLR: style(9) in sys/kern/imgact_elf.c

Signed-off-by: Oliver Pinter <op@freebsd.org>
PAX: style(9) in sys/security/mac_bsdextended/mac_bsdextended.h

Signed-off-by: Oliver Pinter <op@freebsd.org>
PAX SEGVGUARD: style(9) in sys/kern/kern_pax_segvguard.c

Signed-off-by: Oliver Pinter <op@freebsd.org>
PAX ASLR: style(9) in sys/vm/vm_mmap.c

Signed-off-by: Oliver Pinter <op@freebsd.org>