remove BpfLevel and getBpfSupportLevel in favour of isAtLeastKernelVersion am: dcb5228f2c am: 9da4968f92 am: 759e9ee101

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1552952

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I09a8c4357ffb2ccb3124c77d332f67da55f3f470
tree: 71a26bb3e81931899eb12a0273983ea643a316fb
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. PREUPLOAD.cfg