add Linux kernel symbol namespace support am: 977cb756cc am: 4847e566f5

Original change: https://android-review.googlesource.com/c/platform/external/libabigail/+/2252145

Change-Id: I11d807cdef5413d10c5d7675a88feab3c73e1d0b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>