storage: turn off pixel storage debugging code on user builds

The debugging code introduces too much performance overhead for random I/O operations.
Only enable the debugging feature on non-user builds.

Bug: 284231590
Test: boot device
Change-Id: Idf6852060dfd3a250d92147a3ee0f1fe9e6140d4
Signed-off-by: Randall Huang <huangrandall@google.com>
diff --git a/storage/init.storage.rc b/storage/init.storage.rc
new file mode 100644
index 0000000..445f74b
--- /dev/null
+++ b/storage/init.storage.rc
@@ -0,0 +1,2 @@
+on property:ro.build.type=userdebug
+    write /dev/sys/block/bootdevice/pixel/enable_pixel_ufs_logging 1