SUMMARY:
This is the third part of the conversion to a new I²C interface. Thanks to
Kyösti Mälkki for his help with this (his contributions have a '*').

PER-FILE CHANGES:
- Makefile:
  - ovsensor.c needs ov511.h as dependency

- ov511.c:
  - Remove OV8600 and KS0127 stuff, since these won't be supported anytime soon
  - Convert designated structure initializers to ISO C99 standard
  * Rewrite i2c_r(), i2c_w(), and i2c_w_mask() to use kernel I2C interface
  - Remove obsolete i2c_r_p() and ov51x_set_slave_ids()
  - Work around bug in smbus_xfer (it treats positive return value as an error)
  - Use unique (unoffocial) IDs for OV511/OV518 I2C adapter
  - Create I2C client for internal use (ov->internal_client). This obsoletes
    ov->primary_i2c_slave
  - Set internal client address (slave) from init_ov_sensor()
  - Remove some irrelevant comments
  - Set sensor min/max width/height vars from here instead of in sensor drivers
  - ov51x_init_i2c() must be called before sensor probing, but after ov51x init
  * Remove obsolete ov->i2c and ov->i2c_lock stuff
  * Fix memory leak: call ov->sops->unconfigure() on disconnect

- ov511.h:
  * Move I2C address defines to ovsensor.h
  - Add OV511/OV518 I2C IDs
  - Remove i2c_lock and *_i2c_slave from struct usb_ov511
  - Add internal_client to struct usb_ov511

- ov511_decomp.c:
- ov518_decomp.c:
  - Convert designated structure initializers to ISO C99 standard

- [All sensor drivers]:
  * Remove references to struct ov_i2c
  - Move setting of sensor min/max width/height vars to ov511.c
  * Use ov_write_regvals() instead of ovsensor_write_regvals()
  * Add unconfigure function
  * Use ov_write(), etc... instead of i2c->w(), etc...
  - Convert designated structure initializers to ISO C99 standard

- ovsensor.c:
  * Replace ovsensor_write_regvals() with ov_write_regvals()
  * Add ov_write_mask()

- ovsensor.h:
  - Add preliminary (unofficial) I2C driver ID
  - Remove OV8600 and KS0127 stuff
  * Move I2C address defines here, and shift out direction bit
  * Remove struct ov_i2c
  * Add unconfigure() to struct ovsensor_ops
  * Add ov_read() and ov_write() inline functions

- saa7111-new:
  - Fix unlikely, but possible, memory leak
  - Return error if reg writes fail in attach(). This keeps SAA7111 from always
    attaching to OV511.
  - Convert designated structure initializers to ISO C99 standard