Enlarge the timeout from 300 to 1200 msec

Wiping data can't be finished within 300 msec
that leads the polling timeout APP_ERROR_IO while
doing factory reset.

Bug: 163076061
Test: succeed to finish factory reset 100 times
Change-Id: Iee106ffc02db385270da605fad4119f31c8ec4cc
Signed-off-by: Chungjui Fan <chungjuifan@google.com>
diff --git a/libnos_transport/transport.c b/libnos_transport/transport.c
index f7675da..77a430a 100644
--- a/libnos_transport/transport.c
+++ b/libnos_transport/transport.c
@@ -70,7 +70,7 @@
  * expect a reboot to take around 100ms but we'll keep trying for 300ms to leave
  * plenty of margin.
  */
-#define RETRY_COUNT 60
+#define RETRY_COUNT 240
 #define RETRY_WAIT_TIME_US 5000
 
 /* In case of CRC error, try to retransmit */