Improve boot time by 0.1s by reducing a polling sleep interval

Bug: 21516860
Change-Id: I9e28f4d9cc20ec2a7d9e325c02ef85f0ad9b3d60
diff --git a/cryptfs.c b/cryptfs.c
index 355d591..ecfc3a6 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -1413,7 +1413,7 @@
     return rc;
 }
 
-#define DATA_PREP_TIMEOUT 200
+#define DATA_PREP_TIMEOUT 1000
 static int prep_data_fs(void)
 {
     int i;
@@ -1431,7 +1431,7 @@
         if (*p == '1') {
             break;
         } else {
-            usleep(250000);
+            usleep(50000);
         }
     }
     if (i == DATA_PREP_TIMEOUT) {