Enable BrownoutDetection only for debug build

Bug: 237287659
Test: Confirm its only debug build only has BrownoutDetection app
Change-Id: I7810c10c66047c472e799d708eb9a6bd7ccbce20
Signed-off-by: George Lee <geolee@google.com>
diff --git a/battery_mitigation/bcl.mk b/battery_mitigation/bcl.mk
index c74b398..87e0f95 100644
--- a/battery_mitigation/bcl.mk
+++ b/battery_mitigation/bcl.mk
@@ -1,5 +1,7 @@
-PRODUCT_PACKAGES += battery_mitigation \
-		    BrownoutDetection
+PRODUCT_PACKAGES += battery_mitigation
+ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
+PRODUCT_PACKAGES += BrownoutDetection
+endif
 
 BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/battery_mitigation/sepolicy
 PRODUCT_SOONG_NAMESPACES += device/google/gs-common/battery_mitigation