patches/arch/arm64/xor-neon-...: restore trailer (SCS is no longer last)

When the SCS patch was the LAST patch in ohm's cumulative, the
trailing '-- \n2.54.0\n' git-format-patch sentinel was an orphan that
patch(1) read as a malformed header — fixed in 84734ba by stripping
the trailer.

Now besser#18 (queue-pending-record-lock-bh-danctnix) is added at the
end of ohm.yaml's includes. SCS is no longer last. Without its
trailer to mark end-of-patch, patch(1) reads straight into besser#18's
'From d95453c... Mon Sep 17 00:00:00 2001' line and errors as
'malformed patch at line N: From ...'.

Restoring the trailer makes the separator unambiguous again.

Cumulative b2sum: 0eb091ddaba4a8f1c3c2a78... -> ceec602afa8574c74354...
Size: 162 704 -> 162 716 (+12 = the trailer bytes).

This rule — 'only the LAST patch must lack a trailer; all others must
keep theirs' — is sensitive to ohm.yaml include ordering, which is
brittle. Filed as a kernel-agent followup: ka-promote should rewrite
trailers automatically (always add to non-last, always strip from
last) so source patches don't need to be ordering-aware.

patches/arch/arm64/xor-neon-ffixed-x18-scs-build-fix-danctnix/0001-arm64-xor-neon-ffixed-x18-build-fix.patch

@@ -34,3 +34,6 @@ index 1234567..2345678 100644
  endif
  
  lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o
+-- 
+2.54.0
+