update manta bootloader from recovery

Change-Id: I84f2502d72a93a114b43a8845b787a460ae93054
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 888dd2e..6969855 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -69,3 +69,4 @@
 
 TARGET_RECOVERY_PIXEL_FORMAT := RGBX_8888
 TARGET_RECOVERY_UI_LIB := librecovery_ui_manta
+TARGET_RELEASETOOLS_EXTENSIONS := device/samsung/manta