[PATCH] i2c-s3c2410: Enable i2c clock only on xfer

[Vasily Khoruzhick]

I don't see any reason to keep i2c clock enabled all the time when i2c bus 
driver is loaded, and even more: it prevents me to disable uda1380 codec power 
- uda1380 doesn't respond on i2c xfers if its power was disabled during i2c 
clock is enabled.

WinMobile enables i2c clock only on xfer (same for i2s clock)

Regards
Vasily
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