memory manager: improve the reserved memory validation logic

We will have two layers of the validation.

- the first part of the validation logic will be implemented under the
`ValidateKubeletConfiguration` method
- the second one that requires knowledge about machine topology and
node allocatable resources will be implemented under the memory manager.

Signed-off-by: Artyom Lukianov <alukiano@redhat.com>

pkg/kubelet/apis/config/validation/validation.go

@@ -193,6 +193,8 @@ func ValidateKubeletConfiguration(kc *kubeletconfig.KubeletConfiguration) error
 		}
 	}
 
+	allErrors = append(allErrors, validateReservedMemoryConfiguration(kc)...)
+
 	if err := validateKubeletOSConfiguration(kc); err != nil {
 		allErrors = append(allErrors, err)
 	}