IVGCVSW-1863 Support NHWC for L2Normalization
IVGCVSW-1863 Support NHWC for L2Normalization

 * Added L2NormalizationDescriptor to ConvertL2Normalization

!armnn:150051

Change-Id: I622d7a8af2bfd27e7d4543a24c59e53988cb5d82

ARM-software/android-nn-driver,ARM-software/android-nn-driver