Revert "i2c: add fwnode APIs"

This reverts commit ef1e9b62 which is
commit 373c612d upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I005a81bf79fefbb0a037a77c2d248d4790b9a94e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>