Use "include" instead of "-include" wherever appropriate

* When using "-include", make ignores a makefile which does not
  exist, with no error message.
* Use "include" for all makefiles which are essential for a
  working build.

thanks to chirayudesai

https://github.com/CyanogenMod/android_device_sony_blue-common/commit/92cf856b546a28646c06f9cae93e8d5ab8beae09

Change-Id: I1c1fa2887908dd7b022db0d1739fd8893d95dfd6