[PATCH RESEND] i2c: move of helpers into the core

[Wolfram Sang]

> However this patch fails to apply onto either v3.11-rc4 or v3.11-rc6:

Argh, did not drop the MPC patch before rebasing :( So either pick the
patch "i2c: powermac: fix return path on error" before, pull the branch
[1], or force me to resend ;)

Thanks!

[1] git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/core-with-of
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