[FIX] Enable palm rejection for spen on non stock roms

As you might know, palm rejection on non stock roms has not worked for a long time. The symptoms are that when you try to draw with the s-pen in apps like squid or OneNote, often what you draw gets immediately erased.

I went back to CM13.0, where it supposedly did work, and checked what the difference is. I got lucky, and found the right files. It seems that palm rejection was removed from the file InputReader.cpp in frameworks_native/tree/p/services/inputflinger.

I'm sure there was a...

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