Revert "device property: Add fwnode_iomap()"

This reverts commit bf36521e which is
commit eca6e2d4 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: I0f4c39cde36136f09ee9d76150635a943524ae9c
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>