UBUNTU: SAUCE: Add Knights Mill to NO SSB list

BugLink: https://bugs.launchpad.net/bugs/1791080

At the time we backported "x86/bugs: Expose
/sys/../spec_store_bypass" there was no definition
for Knights Mill Atom CPUs. This was added later
when doing L1TF but we did not update the list
of CPUs not affected by SSB.
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/x86/kernel/cpu/common.c

@@ -858,6 +858,7 @@ static const __initconst struct x86_cpu_id cpu_no_spec_store_bypass[] = {
 	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_MERRIFIELD	},
 	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_CORE_YONAH		},
 	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNL		},
+	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNM		},
 	{ X86_VENDOR_CENTAUR,	5,					},
 	{ X86_VENDOR_INTEL,	5,					},
 	{ X86_VENDOR_NSC,	5,					},