Allow bpfloader to execute btfloader

btfloader is a standalone binary that receives a path to a bpf .o file
from bpfloader, parses & loads the BTF type info from the file, passes
BTF info back to bpfloader & exits. Include it in bpfloader's domain &
grant bpfloader permission to run it.

Bug: 203823368
Test: build & boot, bpfloader successfully executes btfloader
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: Ia08776a90763a8477d9f3e393d5d723b88a3176f
2 files changed