lib/utils/stdout_helpers: Move from minimal/uart_extra.c for reuse.

lib/utils/stdout_helpers.c

@@ -4,7 +4,7 @@
 #include "py/mphal.h"
 
 /*
- * Extra UART functions
+ * Extra stdout functions
  * These can be either optimized for a particular port, or reference
  * implementation below can be used.
  */

minimal/Makefile

@@ -45,7 +45,7 @@ LIBS =
 SRC_C = \
 	main.c \
 	uart_core.c \
-	uart_extra.c \
+	lib/utils/stdout_helpers.c \
 	lib/utils/printf.c \
 	lib/utils/pyexec.c \
 	lib/libc/string0.c \