Update CHANGELOG again for libaom v3.8.3

Bug: aomedia:3581
Change-Id: I67eee1bfff0f779ec821408b5a7ca5839754e124

CHANGELOG

diff --git a/CHANGELOG b/CHANGELOG
index 35737c1..84bcba3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -12,6 +12,7 @@
     * aomedia:3561: libaom-3.8.2 armv7 Android build failed
     * aomedia:3580: Allow g_timebase.num to be greater than
       g_timebase.den
+    * Arm SVE build fixes.
     * av1_block_error_lp_neon: fix block_size param type
 
 2024-03-08 v3.8.2