ion: Remove unused heap IDs

Framework code must not use these. Hence, this CL removes
them from the ion header files.

original-kernel-headers/linux/ion_4.19.h was
edited manually and bionic/libc/kernel/tools/clean_header.py
was used to generate the header files in kernel-headers/linux.

Test: make, ion-unit-tests
Bug: 138149732
Change-Id: I698a8e1b6658d02a69b3b5fe3ba0d2604d2ed40d
3 files changed