distro/rhel90: blacklist skx_edac,intel_cstate kernel modules on azure

Disabled by the MSFT images, we follow suit (really means we don't
exactly know why and should find out).

internal/distro/rhel90/distro.go

@@ -948,6 +948,18 @@ func newDistro(distroName string) distro.Distro {
 						osbuild.NewModprobeConfigCmdBlacklist("floppy"),
 					},
 				},
+				{
+					Filename: "blacklist-skylake-edac.conf",
+					Commands: osbuild.ModprobeConfigCmdList{
+						osbuild.NewModprobeConfigCmdBlacklist("skx_edac"),
+					},
+				},
+				{
+					Filename: "blacklist-intel-cstate.conf",
+					Commands: osbuild.ModprobeConfigCmdList{
+						osbuild.NewModprobeConfigCmdBlacklist("intel_cstate"),
+					},
+				},
 			},
 			CloudInit: []*osbuild.CloudInitStageOptions{
 				{