doc: release-notes-2.2: mention clock_control callback prototype change

Mentioned that callback has one additional parameter (subsys). Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
zephyrproject-rtos · Feb 5, 2020 · 8df133e · 8df133e
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commit 8df133e
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diff --git a/doc/releases/release-notes-2.2.rst b/doc/releases/release-notes-2.2.rst
@@ -91,6 +91,11 @@ Stable API changes in this release
     Usage of 8-bit write block size emulation is only recommended for
     compatibility with older storage contents.
 
+* Clock control
+
+  * The callback prototype (clock_control_cb_t) has now additional argument
+    (clock_control_subsys_t) indicating which clock subsystem got started.
+
 Removed APIs in this release
 ============================