apply 'fs_bpf_tethering' label to /sys/fs/bpf/tethering

We want to label /sys/fs/bpf/tethering/... with a new label distinct
from /sys/fs/bpf, as this will allow locking down the programs/maps
tighter then is currently possible with the existing system.

These programs and maps are provided via the tethering mainline module,
and as such their number, names, key/value types, etc. are all prone to
be changed by a tethering mainline module update.

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ifc4108d76a1106a936b941a3dda1abc5a65c05b0
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 05dc06f..d205cd5 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -349,3 +349,4 @@
 genfscon usbfs / u:object_r:usbfs:s0
 genfscon binfmt_misc / u:object_r:binfmt_miscfs:s0
 genfscon bpf / u:object_r:fs_bpf:s0
+genfscon bpf /tethering u:object_r:fs_bpf_tethering:s0