x86/cpuid: Handle more simple Intel leaves in guest_cpuid()

x86/cpuid: Handle more simple Intel leaves in guest_cpuid()

Intel now document leaf 2 as a plain leaf, with %al always containing the
value 0x01.  Collect this leaf normally in calculate_raw_policy() and expose
it to guests.  The leaf is reserved by AMD.

Intel leaves 3 and 9 (PSN and DCA respectively) are not exposed to guests at
all.  They are reserved by AMD.

Leaves 8 and 0xc are reserved by both vendors.

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