systemd: fix noisy messages about eBPF

Patch systemd sources to fix detection of availability of
the kernel CONFIG_CGROUP_BPF option.

Resolves openbmc/linux#159

(From meta-phosphor rev: 7fbc79b12dc5e137830ffd35c0be839fe77b6699)

Change-Id: I82cd227cb6e14ca57a373b1c6a100a98cff799af
Signed-off-by: Alexander Filippov <a.filippov@yadro.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-core/systemd/systemd_%.bbappend b/meta-phosphor/recipes-core/systemd/systemd_%.bbappend
index b403069..bc568cd 100644
--- a/meta-phosphor/recipes-core/systemd/systemd_%.bbappend
+++ b/meta-phosphor/recipes-core/systemd/systemd_%.bbappend
@@ -13,6 +13,7 @@
 #TODO upstream the below patch via below issue
 #https://github.com/openbmc/openbmc/issues/2016
 SRC_URI += "file://0005-dont-return-error-if-unable-to-create-network-namespace.patch"
+SRC_URI += "file://0006-core-fix-the-check-if-CONFIG_CGROUP_BPF-is-on.patch"
 
 RRECOMMENDS_${PN} += "obmc-targets"
 FILES_${PN} += "${systemd_unitdir}/network/default.network"