KVER macro - support 4.9.256+ kernel am: 30af4b5487 am: c90cd5a93e

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1584754

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I704b65bdf6d54b07f2105357dd8c5e116bc3efbd