esp8266: Switch back to flashing combined firmware (single file).

With gap between segments minimized, there's not much padding to flash,
so no big speed overhead.

esp8266/Makefile

@@ -149,8 +149,8 @@ $(BUILD)/frozen.c: $(wildcard $(SCRIPTDIR)/*) $(CONFVARS_FILE)
 
 deploy: $(BUILD)/firmware-combined.bin
 	$(ECHO) "Writing $< to the board"
-	#$(Q)esptool.py --port $(PORT) write_flash 0 $<
-	$(Q)esptool.py --port $(PORT) --baud $(BAUD) write_flash --flash_size=8m 0 $(BUILD)/firmware.elf-0x00000.bin 0x9000 $(BUILD)/firmware.elf-0x0[1-f]000.bin
+	$(Q)esptool.py --port $(PORT) --baud $(BAUD) write_flash --flash_size=8m 0 $<
+	#$(Q)esptool.py --port $(PORT) --baud $(BAUD) write_flash --flash_size=8m 0 $(BUILD)/firmware.elf-0x00000.bin 0x9000 $(BUILD)/firmware.elf-0x0[1-f]000.bin
 
 reset:
 	echo -e "\r\nimport pyb; pyb.hard_reset()\r\n" >$(PORT)