conf: Disable buildstats by default

To optimize building time and build outputs size disable collecting of
build statistics in default configuration.
It can be enabled for debugging by the user.

Signed-off-by: Anton Mikanovich <amikan@ilbers.de>

meta-isar/conf/local.conf.sample

@@ -233,7 +233,7 @@ USER_isar[password] = "isar"
 USER_isar[flags] += "clear-text-password"
 
 # Use buildstats by default
-USE_BUILDSTATS = "1"
+#USE_BUILDSTATS = "1"
 
 # Uncomment the below line to debug WIC.
 # WIC_CREATE_EXTRA_ARGS += "-D"