lkl: systemd: fix udev rule to properly filter for USB devs

The previous filter accepted non-usb block devices, which resulted in
unexpected EFI partition mounts. Split the filter and check for
ENV{ID_BUS}!="usb". Tested on systemd-udevd 254 and 257 systems.

Signed-off-by: David Disseldorp <ddiss@suse.de>
(cherry picked from commit 101d4a4d0fdd6fe6203831b917ce74bbb7a77fe0)
Link: lkl/linux#617

Author: ddiss

tools/lkl/systemd/61-lklfuse.rules

@@ -1,4 +1,5 @@
-SUBSYSTEM!="block", SUBSYSTEMS!="usb", GOTO="lklfuse_end"
+SUBSYSTEM!="block", GOTO="lklfuse_end"
+ENV{ID_BUS}!="usb", GOTO="lklfuse_end"
 #TAG+="lklfuse-dbg-block-filter"
 # XXX remove should be handled by systemd service ConditionPathExists for %k
 # device node, but it doesn't appear to work, so manually stop.