Run logd only when debug_level is set

When debug_level is set to none, logd is not started at all.

Bug: 200914564
Test: run a VM with and without --debug full
Change-Id: Idb1ea3753067242eb0dcd53d3ae783e9e947ca32
diff --git a/microdroid/bootconfig.normal b/microdroid/bootconfig.normal
index f7cdfc7..9cfb55a 100644
--- a/microdroid/bootconfig.normal
+++ b/microdroid/bootconfig.normal
@@ -6,3 +6,6 @@
 
 # ADB is not enabled.
 androidboot.adb.enabled=0
+
+# logd is not enabled
+androidboot.logd.enabled=0