CHANGELOG.md: Finalize changes in 4.19 release cycle

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
(cherry picked from commit 8b5016e287)

CHANGELOG.md

@@ -23,11 +23,20 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
    using a standalone library implementation.
  - xenalyze no longer requires `--svm-mode` when analyzing traces
    generated on AMD CPUs
+ - Code symbol annotations and MISRA compliance improvements.
+ - CI updates:
+   - Minimum fixes to rebuild the containers, following the HEREDOC problems.
+   - Rebuild containers to have testing with up-to-date LTS distros.
+   - Few build system checks, and strip the obsolete contents of
+     the build containers.
 
 ### Added
  - On x86:
    - Introduce a new x2APIC driver that uses Cluster Logical addressing mode
      for IPIs and Physical addressing mode for external interrupts.
+ - On Arm:
+   - FF-A notification support.
+   - Introduction of dynamic node programming using overlay dtbo.
  - Add a new 9pfs backend running as a daemon in dom0. First user is
    Xenstore-stubdom now being able to support full Xenstore trace capability.
  - libxl support for backendtype=tap with tapback.