usr: Add initramfs for Venturi

Change-Id: Idaa81d7d43cebe490d768a3a8adeefa2cf7bd33a
arm: s5pv210: venturi: Normalize keypad device name

Change-Id: I7ab822324cbdb8c7e2191fa555543594b2e5f509
arm: s5pv210: venturi: Fill out i2c devices

* Add guards around s3c i2c to silence warning
* Board info taken directly from stock Samsung kernel; the appropriate
  headers and platform data need to be included before they are enabled

Change-Id: I49de09a885e91eb25bbc71be46c26481bb06b77e