x86/svm: Drop svm_segment_register_t

x86/svm: Drop svm_segment_register_t

Most SVM code already uses struct segment_register.  Drop the typedef and
adjust the definitions in struct vmcb_struct, and svm_dump_sel().  Introduce
some build-time assertions that struct segment_register from the common
emulation code is usable in struct vmcb_struct.

While making these adjustments, fix some comments to not mix decimal and
hexidecimal offsets, and drop all trailing whitespace in vmcb.h

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>