Adding s390x plaform validation in install config

Author: phani0041gs

pkg/asset/agent/installconfig.go

@@ -102,6 +102,9 @@ func (a *OptionalInstallConfig) validateSupportedPlatforms(installConfig *types.
 	if installConfig.Platform.Name() != none.Name && installConfig.ControlPlane.Architecture == types.ArchitecturePPC64LE {
 		allErrs = append(allErrs, field.Invalid(fieldPath, installConfig.Platform.Name(), fmt.Sprintf("CPU architecture \"%s\" only supports platform \"%s\".", types.ArchitecturePPC64LE, none.Name)))
 	}
+	if installConfig.Platform.Name() != none.Name && installConfig.ControlPlane.Architecture == types.ArchitectureS390X {
+		allErrs = append(allErrs, field.Invalid(fieldPath, installConfig.Platform.Name(), fmt.Sprintf("CPU architecture \"%s\" only supports platform \"%s\".", types.ArchitectureS390X, none.Name)))
+	}
 	if installConfig.Platform.Name() == external.Name {
 		if installConfig.Platform.External.PlatformName != string(models.PlatformTypeOci) {
 			fieldPath = field.NewPath("Platform", "External", "PlatformName")