esp8266: Put utils.o to FlashROM.

esp8266/esp8266.ld

@@ -130,6 +130,7 @@ SECTIONS
         *gccollect.o(.literal* .text*)
         *gchelper.o(.literal* .text*)
         *lexerstr32.o(.literal* .text*)
+        *utils.o(.literal* .text*)
         *modpyb.o(.literal*, .text*)
         *modpybpin.o(.literal*, .text*)
         *modpybpwm.o(.literal*, .text*)