If you want you can select only the GLCM parameters of HH polarization and perform a PCA. The results of GLCM in HH polarization is much better and the information in the image is kept compared to HV polarization. In order to achieve comparable results in HV polarization , we need to set the quantization level should be very high (128) which is not very efficient.
So, you can try selecting only the GLCM features in HH polarization and perform PCA on that. Then, perform classification and see if your classification accuracy is increased