Stop printing BPF support level.

This is basically equivalent to Linux kernel version number and as
such pretty spurious.  This is the only user of BpfLevelToString()

Test: builds, atest, TreeHugger
Bug: 167500195
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8479f6ffab5f4232dfc2f7cecffb8582d0375edb
1 file changed