health service can write kernel log

Test: device without healthd still have battery level messages
Bug: 77541952
Fixes: 77661605
Change-Id: I9b66ecde0735accf8b2d67b9562795be80071dd9
diff --git a/healthd/android.hardware.health@2.0-service.rc b/healthd/android.hardware.health@2.0-service.rc
index 8b86868..dca0ccc 100644
--- a/healthd/android.hardware.health@2.0-service.rc
+++ b/healthd/android.hardware.health@2.0-service.rc
@@ -2,3 +2,4 @@
     class hal
     user system
     group system
+    file /dev/kmsg w