Updated non-blocking PDCP socket

More accurately, we changed the do/while infinite
loop to be an infinite for loop for the read command of
the socket. The socket file descriptor choice is more clear now.

nfapi/open-nFAPI/pnf/inc/pnf_p7.h

@@ -25,7 +25,7 @@
 
 #include "nfapi_pnf_interface.h"
 
-#define NFAPI_MAX_PACKED_MESSAGE_SIZE 8192
+#define NFAPI_MAX_PACKED_MESSAGE_SIZE 4096
 
 typedef struct {
 	uint16_t dl_conf_ontime;