rp2/mpconfigport: Enable MICROPY_PY_OS_DUPTERM_NOTIFY.

Signed-off-by: Damien George <damien@micropython.org>

ports/rp2/mpconfigport.h

@@ -98,6 +98,7 @@
 #define MICROPY_PY_OS_INCLUDEFILE               "ports/rp2/modos.c"
 #ifndef MICROPY_PY_OS_DUPTERM
 #define MICROPY_PY_OS_DUPTERM                   (1)
+#define MICROPY_PY_OS_DUPTERM_NOTIFY            (1)
 #endif
 #define MICROPY_PY_OS_SYNC                      (1)
 #define MICROPY_PY_OS_UNAME                     (1)