Re-add deleted linker options to the Bootloader makefiles, which was preventing the compiled application from being shifted into the bootloader section address space.

Bootloaders/DFU/makefile

@@ -325,6 +325,7 @@ EXTMEMOPTS =
 #    -Map:      create map file
 #    --cref:    add cross reference to  map file
 LDFLAGS  = -Wl,-Map=$(TARGET).map,--cref
+LDFLAGS += -Wl,--section-start=.text=$(BOOT_START)
 LDFLAGS += -Wl,--relax 
 LDFLAGS += -Wl,--gc-sections
 LDFLAGS += $(EXTMEMOPTS)