x86: drop unused and non-useful feature definitions

x86: drop unused and non-useful feature definitions

None of these features are interesting for Xen to use, or to be advertised to
guests.  Doing so identifies further areas of code which can be removed now
that 32bit support has been dropped.

IA64 has a sole user in microcode_intel.c.  While it is plausible for a 32bit
x86 hypervisor to get there via IA64's x86 emulation, a 64bit x86 hypervisor
most certainly won't.

MP proves to be more complicated.  It is only advertised on some K7
processors, not on K8 or newer, and now listed as reserved in the AMD manual.
Cleaning this up reveals two chunks of common SMP code which was only
applicable to K7 processors, which are 32bit only.

While cleaning this area up, remove the inconsistent use of newlines in the
cpu_has_* definition block.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>