Fixing input serial line initialization pointed by Peter Sjödin/KTH

For avr-rss2 platform

platform/avr-rss2/README.md

@@ -110,14 +110,6 @@ Tested applications and examples
 * `examples/powertrace`
 * `example-shell`
 
-Note that the shell example needs file `symbols.c` to be added to project also seems like
-in `core/dev/serial-line.c` the function `process_poll` must be replaced with `process_post`:
-
-     /* Wake up consumer process */
-    -  process_poll(&serial_line_process);
-    +  process_post(&serial_line_process, 0, 0);
-
-
 Platform tutorial applications
 -----------------------------
 Example to read out various sensors, leds, serial numbers, and so on:

platform/avr-rss2/contiki-main.c

@@ -71,6 +71,7 @@
 #include "contiki-lib.h"
 
 #include "dev/rs232.h"
+#include "dev/serial-line.h"
 #include "dev/slip.h"
 
 #if AVR_WEBSERVER
@@ -267,6 +268,10 @@ initialize(void)
   process_start(&etimer_process, NULL);
   ctimer_init();
 
+  /* After process start */
+  serial_line_init();
+  rs232_set_input(RS232_PORT_0, serial_line_input_byte);
+
   /* Start radio and radio receive process */
   NETSTACK_RADIO.init();