Automatic update of Sony kernel configurations (Not tested)

Commands used for update:
1) cp arch/arm/configs/riogrande_<codename>_defconfig .config;
2) yes "" | make oldconfig;
3) mv .config tmpConfig;
4) scripts/kconfig/merge_config.sh -m
     ./tmpConfig
     android/configs/android-base.cfg
     android/configs/android-recommended.cfg;
5) mv .config arch/arm/configs/riogrande_<codename>_defconfig

References:
- https://source.android.com/devices/tech/kernel.html
- http://serverfault.com/questions/116299/automatically-answer-defaults-when-doing-make-oldconfig-on-a-kernel-tree