Fix expansion controller reading in NSF player

[consolethinks]

NSF Player fix

• Optimised code a little by removing useless nop's from controller reading routine (can be omitted from this request)
• More importantly, it fixes expansion controller reading for Famicom users with third party controllers.
  Note that this fix aligns with how the menu reads controllers (both internal and external) and still keeps the DPCM safeguard

[consolethinks]

Fix: RAM reset for proper playback of certain NSF files

• If the game's sound driver depends on internal RAM or WRAM, those sometimes need to be reset to avoid certain channels from continuing playback of the previous track
• This second commit fixes this issue by adding a RAM reset code to the init, while also skipping the stack

Example NSF: A nightmare on Elm Street (sound effects mainly)