Unfortunately that does nothing.
The only thing that works is turning the TV's ability to broadcast HDR content OFF. Once this is done, the game essentially sees a non HDR TV and doesn't attempt to use the HDR software.
The problem is most definitely on either EA or Sony in how the HDR within Madden 18 is being handled. All EA has to do is pop in a disc with a standard PS4 and watch the picture turn to garbage after the game begins trying to use the HDR programming.
EDIT to note for anyone not sure how to turn OFF the TV's ability to use HDR on the Samsung KS line of TV's. Go into the settings and find UHD Color, turn the HDMI port that the PS4 is connected to OFF. So ON = HDR and OFF = No HDR.