fsm9900: disable logs in user builds

Disable LK logging in user variant builds.

Change-Id: I607aa2c502a8a763ab42886b2d37a72507b29b21
diff --git a/project/fsm9900.mk b/project/fsm9900.mk
index 993b34a..0f91c53 100644
--- a/project/fsm9900.mk
+++ b/project/fsm9900.mk
@@ -6,7 +6,12 @@
 
 MODULES += app/aboot
 
+ifeq ($(TARGET_BUILD_VARIANT),user)
+DEBUG := 0
+else
 DEBUG := 1
+endif
+
 EMMC_BOOT := 1
 ENABLE_SDHCI_SUPPORT := 1