Revert "serial: max310x: implement I2C support"

This reverts commit 85d79478 which is
commit 2e1f2d9a 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: I16bdb88a23acb5148cb53af95b47e75c14ce83c3
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>