[PATCH v2] CHANGELOG.md: Update for 4.21 release cycle

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Chnages in v2:
- Drop the following items:
  - Allow to unflatten DTs.
  - Basic kexec support to Mini-OS for running in PVH mode.
---
 CHANGELOG.md | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca1b43b940..0afd2eeb4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
  - Debian Trixie added to CI.  Debian Bullseye retired from CI for RISC-V due
    to the baseline change.
  - Linux based device model stubdomains are now fully supported.
+ - Remove libxenctrl usage from xenstored.
 
  - On x86:
    - Restrict the cache flushing done as a result of guest physical memory map
@@ -38,9 +39,17 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
      and 28 (Temperature Probe).
 
  - On Arm:
-    - Ability to enable stack protector
+    - Ability to enable stack protector.
     - GICv3.1 eSPI (Extended Shared Peripheral Interrupts) support for Xen
       and guest domains.
+    - SMMU handling for PCIe passthrough.
+    - R-Car Gen4 PCI host controller support.
+    - SCI SCMI SMC single-agent support.
+    - Initial support for MPU, R82, and R52: reaches the early boot stages.
+
+ - On RISC-V:
+    - Basic UART support and external interrupts (APLIC/IMSIC only) handling
+      for hypervisor mode.
 
 ### Removed
  - On x86:
-- 
2.51.0