Hide battery percentage from accessibility.

It's parent already has a content description containing the percentage.
Its duplicative to have both.

Test: manual
Change-Id: I5119a1b4fa101726b26da9e226a51891f6b39892
Fixes: 65124571
diff --git a/packages/SystemUI/res/layout/battery_percentage_view.xml b/packages/SystemUI/res/layout/battery_percentage_view.xml
index deb494f..59c0957 100644
--- a/packages/SystemUI/res/layout/battery_percentage_view.xml
+++ b/packages/SystemUI/res/layout/battery_percentage_view.xml
@@ -26,4 +26,5 @@
         android:textColor="?android:attr/textColorPrimary"
         android:gravity="center_vertical|start"
         android:paddingEnd="@dimen/battery_level_padding_start"
+        android:importantForAccessibility="no"
         />