msm8974: disable logs in user builds

Added checks on target build variant to suppress
LK logs in user variant builds.

CRs-Fixed: 697570
Change-Id: I7b7fd66f7ab46f93493998cd11e881aa7acf7b88
diff --git a/project/msm8974.mk b/project/msm8974.mk
index a6ca245..fbdfc82 100644
--- a/project/msm8974.mk
+++ b/project/msm8974.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
 ENABLE_USB30_SUPPORT := 1