SYNC TO KERNEL:
- Back out 2.5.5 kvirt_to_pa() changes (necessary function wasn't exported)
- New memory management code for 2.5.6-pre1

NEW FEATURES:
- Added compile-time option to disable format conversion
  (#define OV511_ALLOW_CONVERSION in ov511.c)
- Preliminary support for TV tuners (only basic detection works so far)

BUG FIXES:
- Fixed error checking during i2c detection in ov511_configure()
- ov511.h: Eliminated redundant usb_ov511.tuner variable
- ov518_decomp.c: Tables and functions should have been static
- i2c_algo_usb.c: Functions should have been static
- i2c_algo_usb.c: Fixed printk() statements

INTERNAL CHANGES:
- Consolidated slave ID setup code into i2c_set_slave_internal()
- New ov511_i2c_w_raw() function for tuner/audiochip support
- Rewrite of ov51x_i2c_write_multiple()
- Got rid of GBR420 parsing code
- New decompression module locking scheme (decomp_ops->owner)
- ov511_postprocess() split into separate YUV420/Grey functions
- Export versioned symbols to decompressor
- ov511_decomp.c: Simplified 1-D iDCT with macros
- i2c_algo_usb.c: Updated to 2.2.x-style module init