Mapped dualanalog and flightstick modes to core setting

This should fix this issue:
https://github.com/libretro/mednafen-libretro/issues/32

According to this:
http://mednafen.sourceforge.net/documentation/09x/psx.html#Section_multitap

RetroArch now sets mednafen's controller type to dualshock if controller type is Joystick + Analog. I've made this configurable.

You can change analog controller type in core settings

I tried descent with analogjoy (flightstick) and it worked well, tried GT2 with dualanalog and I got no vibration as it should be, with dualshock I get vibration. 

It requires a content reset, I don't know if it's ok to call hookup_ports() after changing core settings.