SUMMARY:
Compile is fixed on 2.4.18, some minor bugs are fixed, and the code is
simplified some more.

PER-FILE CHANGES:
- ov511.c:
  - Remove remaining sensor_gbr code
  - Fix compile error on 2.4.18 due to mmx detection changes
  - Add OV518-specific register dump code
  - Move some debug code into sensor code files
  - Make argument to sensor_command() be an (int *) rather than (void *). This
    simplifies the code greatly and will make V4L2 easier to implement.
  - OV6630 needs different register 0x14 settings than OV6620 in
    mode_init_ov_sensor_regs()

- [All OmniVision sensor code]
  - Make argument to sensor_command() be an (int *) rather than (void *).
  - Add generic debug sensor_command() message, now that we know the arg is of
    type (int *).

- ovsensor.h:
  - Make argument to sensor_command() be an (int *) rather than (void *).