fix(components): Fix all components's compile warning and enable warning checking

components/esp8266/Makefile.projbuild

@@ -66,9 +66,3 @@ endif
 
 # global CFLAGS for ESP8266
 CFLAGS += -DMEMLEAK_DEBUG -DICACHE_FLASH
-
-# void compiler error, we should remove these later
-CFLAGS += -Wno-error=char-subscripts -Wno-error=unknown-pragmas -Wno-error=implicit-function-declaration \
-          -Wno-error=pointer-sign -Wno-error=switch -Wno-error=maybe-uninitialized -Wno-error=format= \
-          -Wno-error=unused-value -Wno-error=address -Wno-error=return-type -Wno-error=format-extra-args \
-          -Wno-error=format-zero-length -Wno-error=unused-label -Wno-error=sizeof-pointer-memaccess

components/esp8266/driver/uart.c

@@ -15,6 +15,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdio.h>
 
 #include "esp8266/pin_mux_register.h"
 #include "esp8266/uart_register.h"