Revert "Merge branch 'mctp-i2c-driver'"

Revert "Merge branch 'mctp-i2c-driver'"

This reverts commit 6fa390a81f44a84575e558232afcbd2ceb1c2391, reversing
changes made to 47d95f289c07773b12e946055cac8942b31cb704.

Wolfram Sang says:

Please revert. Besides the driver in net, it modifies the I2C core
code. This has not been acked by the I2C maintainer (in this case me).
So, please don't pull this in via the net tree. The question raised here
(extending SMBus calls to 255 byte) is complicated because we need ABI
backwards compatibility.

Link: https://lore.kernel.org/all/YZJ9H4eM%2FM7OXVN0@shikoro/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>