arch: Add compatibility check for CPUID.0x7.0x2:EDX

Register EDX of CPUID leaf 0x7 sub-leaf 0x2 (Structured Extended Feature
Enumeration Sub-leaf) is currently not checked, but it should be.

KVM supports several of the features enumerated by this value when they
are supported by the host such as Intel PSFD, IPRED_CTRL, RRSBA_CTRL
and more.

The migration destination needs to support any such feature exposed to
the guest from the migration source.

Signed-off-by: Oliver Anderson <oliver.anderson@cyberus-technology.de>
On-behalf-of: SAP oliver.anderson@sap.com

arch/src/x86_64/mod.rs

@@ -463,6 +463,12 @@ impl CpuidFeatureEntry {
                 feature_reg: CpuidReg::EDX,
                 compatible_check: CpuidCompatibleCheck::BitwiseSubset,
             },
+            CpuidFeatureEntry {
+                function: 7,
+                index: 2,
+                feature_reg: CpuidReg::EDX,
+                compatible_check: CpuidCompatibleCheck::BitwiseSubset,
+            },
             // Leaf 0x8000_0001, ECX/EDX, CPUID features bits
             CpuidFeatureEntry {
                 function: 0x8000_0001,