platform: msm8996: Enable dload mode for 8996

Add support to enter download mode on 8996 whenever there is a crash
in LK

Change-Id: Id0c62ffa8ec91618e7a577bdbe3a02236bd6ff38
diff --git a/project/msm8996.mk b/project/msm8996.mk
index a78e6b4..dfe74cf 100644
--- a/project/msm8996.mk
+++ b/project/msm8996.mk
@@ -64,3 +64,6 @@
 endif
 
 CFLAGS += -Werror
+
+#SCM call before entering DLOAD mode
+DEFINES += PLATFORM_USE_SCM_DLOAD=1