bpfloader: use kernel logs

Boots early. logd no workie!

Bug: 210919187
Test: see bpfloader logs
Change-Id: I313f55b0a6e1164fdffeb2d07952988d5e560ae7
diff --git a/private/bpfloader.te b/private/bpfloader.te
index 650117e..02337a0 100644
--- a/private/bpfloader.te
+++ b/private/bpfloader.te
@@ -3,6 +3,9 @@
 type bpfloader_exec, system_file_type, exec_type, file_type;
 typeattribute bpfloader coredomain;
 
+# allow bpfloader to write to the kernel log (starts early)
+allow bpfloader kmsg_device:chr_file w_file_perms;
+
 # These permissions are required to pin ebpf maps & programs.
 allow bpfloader { fs_bpf fs_bpf_tethering }:dir { add_name create search write };
 allow bpfloader { fs_bpf fs_bpf_tethering }:file { create read setattr };