CFG: Implemented the GetConfigInfoBlk2 function.

Added a "config" file to the CFG process service (CFG:U), and added a few default blocks to it.

Implemented GetSystemModel and GetModelNintendo2DS
According to 3dbrew, if the size of the block is 4 bytes or less, then the data is directly written to the header of the block. The size of the 0xF0004 block (System Model) is 4 bytes, so it's up there in line 301