edbg.inc.mk: do not erase the whole rom before flashing

This mimics openocd behaviour that only erase needed sectors of the rom.

makefiles/tools/edbg.inc.mk

@@ -10,7 +10,7 @@ HEXFILE = $(BINFILE)
 ifneq (,$(DEBUG_ADAPTER_ID))
   EDBG_ARGS += --serial $(DEBUG_ADAPTER_ID)
 endif
-FFLAGS ?= $(EDBG_ARGS) -t $(EDBG_DEVICE_TYPE) -b -e -v -p -f $(HEXFILE)
+FFLAGS ?= $(EDBG_ARGS) -t $(EDBG_DEVICE_TYPE) -b -v -p -f $(HEXFILE)
 
 ifeq ($(RIOT_EDBG),$(FLASHER))
   FLASHDEPS += $(RIOT_EDBG)