meta: Add/fix missing Upstream-Status to patches

This adds or fixes the Upstream-Status for all remaining patches missing it
in OE-Core.

(From OE-Core rev: 563cab8e823c3fde8ae4785ceaf4d68a5d3e25df)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd/0017-remove-duplicate-include-uchar.h.patch

@@ -6,6 +6,7 @@ Subject: [PATCH 17/19] remove duplicate include uchar.h
 missing.h already includes it
 
 Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
 ---
  src/basic/escape.h | 1 -
  src/basic/utf8.h   | 1 -

meta/recipes-core/systemd/systemd/0018-check-for-uchar.h-in-configure.patch

@@ -6,6 +6,7 @@ Subject: [PATCH 18/19] check for uchar.h in configure
 Use ifdef to include uchar.h
 
 Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Upstream-Status: Pending
 ---
  configure.ac        | 1 +
  src/basic/missing.h | 2 ++

meta/recipes-core/systemd/systemd/0020-back-port-233-don-t-use-the-unified-hierarchy-for-the-systemd.patch

@@ -25,6 +25,8 @@ Too many things don't get along with the unified hierarchy yet:
 So revert the default to the legacy hierarchy for now. Developers of the above
 software can opt into the unified hierarchy with
 "systemd.legacy_systemd_cgroup_controller=0".
+
+Upstream-Status: Backport
 ---
  src/basic/cgroup-util.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)