Revert "of/platform: Use platform_device interface"

This reverts commit b6d2233f as it
breaks working machines.

Cc: Rob Herring <robh@kernel.org>
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>