project: mdm9635: Add support to override linker

Some target use ld.bfd linker instead of ld, override
the specific linker from project makefile.

CRs-Fixed: 626209
Change-Id: Ie3da26da44c33f4d3757cbb99628270842c68a63
diff --git a/project/mdm9635.mk b/project/mdm9635.mk
index 10abd74..eec4abe 100644
--- a/project/mdm9635.mk
+++ b/project/mdm9635.mk
@@ -15,3 +15,6 @@
 
 #disable Thumb mode for the codesourcery/arm-2011.03 toolchain
 ENABLE_THUMB := false
+
+#Override linker for mdm targets
+LD := $(TOOLCHAIN_PREFIX)ld.bfd