target-i386: Add missing 'static' and 'const' attributes

This fixes warnings from the static code analysis (smatch).

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 7a295f6..4389959 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -122,7 +122,7 @@
     return cpuid;
 }
 
-struct kvm_para_features {
+static const struct kvm_para_features {
     int cap;
     int feature;
 } para_features[] = {