Add an option to enable Clean HDMI for NEX 5N(and maybe others with same soc)

[leonardcoutinho]

I'm working on updatershell of pmca and I found an bug on my 5n but is good thing. Is an solution for clean hdmi.

I changed the codec key (id=0x01070087) from AVCHD, value 03, to XAVC, value 0a, but camera don't have this codec. The thing is, when I press the record button the screen was clean, only camera image, no overlay. Then I put hdmi cable and voila, clean hdmi nicely. Maybe this fix can be included in tweak options. To remove this hack is easy, only change video format to avchd again.

There some people with 5n with tested this method and work, I did an video too. https://www.youtube.com/watch?v=sUqMf6FcSF8

I did this thread issue to document: ma1co/Sony-PMCA-RE#448