libion: convert a header file using update_all.py

ion_4.12.h is ported from old Linux Kernel Driver.
According to the header comment, this is licensed under GPLv2.
This header is referred from ion.c.

To clarify license matter just in case, let's convert it using
update_all.py in bionic repository.

The original header is moved under original-kernel-headers/linux
directory.

Found this during FOSSID trial.

Test: build and boot
Change-Id: Iabd46f33968a0fbce14a501238730714c4f2cfc6
Signed-off-by: Yoshitaka Seto <yoshitaka.seto@sony.com>