i386: remove the new CPUID 'PCONFIG' from Icelake-Server CPU model

PCONFIG is not available to guests; it must be specifically enabled
using the PCONFIG_ENABLE execution control.  Disable it, because
no one can ever use it.
Signed-off-by: NRobert Hoo <robert.hu@linux.intel.com>
Message-Id: <1545227081-213696-2-git-send-email-robert.hu@linux.intel.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

target/i386/cpu.c

@@ -2650,8 +2650,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
             CPUID_7_0_ECX_AVX512VNNI | CPUID_7_0_ECX_AVX512BITALG |
             CPUID_7_0_ECX_AVX512_VPOPCNTDQ | CPUID_7_0_ECX_LA57,
         .features[FEAT_7_0_EDX] =
-            CPUID_7_0_EDX_PCONFIG | CPUID_7_0_EDX_SPEC_CTRL |
-            CPUID_7_0_EDX_SPEC_CTRL_SSBD,
+            CPUID_7_0_EDX_SPEC_CTRL | CPUID_7_0_EDX_SPEC_CTRL_SSBD,
         /* Missing: XSAVES (not supported by some Linux versions,
                 * including v4.1 to v4.12).
                 * KVM doesn't yet expose any XSAVES state save component,