docs(changelog): add scopes for STM32MP2

Add stm32mp2 and stm32mp2-fdts scopes.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I4d1918cf40d44244675f58e6967119515edba943
diff --git a/changelog.yaml b/changelog.yaml
index 9f5d4b7..cdbedbb 100644
--- a/changelog.yaml
+++ b/changelog.yaml
@@ -589,6 +589,9 @@
               - title: STM32MP15
                 scope: stm32mp15
 
+          - title: STM32MP2
+            scope: stm32mp2
+
       - title: Texas Instruments
         scope: ti
 
@@ -1225,6 +1228,9 @@
               - title: STM32MP15
                 scope: stm32mp15-fdts
 
+          - title: STM32MP2
+            scope: stm32mp2-fdts
+
       - title: PIE
         scope: pie