[media] em28xx-i2c: cleanup I2C debug messages
The I2C output messages is too polluted. Clean it a little
bit, by:
- use the proper core support for memory dumps;
- hide most stuff under the i2c_debug umbrella;
- add the missing KERN_CONT where needed;
- use 2 levels or verbosity. Only the second one
will show the I2C transfer data.
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>
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