msmzirc: disable logs in user builds

Disable LK logging in user variant builds.

Change-Id: I5c73c32d9d609f586049428bc4f9f78231f11d6e
diff --git a/project/msmzirc.mk b/project/msmzirc.mk
index e2a3f42..1e46819 100644
--- a/project/msmzirc.mk
+++ b/project/msmzirc.mk
@@ -4,7 +4,12 @@
 
 TARGET := msmzirc
 
+ifeq ($(TARGET_BUILD_VARIANT),user)
+DEBUG := 0
+else
 DEBUG := 1
+endif
+
 ENABLE_USB30_SUPPORT := 1
 ENABLE_SDHCI_SUPPORT := 1
 ENABLE_BOOT_CONFIG_SUPPORT := 1