fs_mgr: fix crash on "noemulatedsd" in fstab

MF_FORCECRYPT claimed same flag value as existing MF_NOEMULATEDSD.
MF_FORCECRYPT also crashes if no "=" in the option.

Modify MF_NOEMULATEDSD flag value to unique, and reformat comment to keep
the definition near the other defines.

Change-Id: Iec86f40ff43eea14b791d3d19c0ae11fd4b5f784
diff --git a/fs_mgr/fs_mgr_priv.h b/fs_mgr/fs_mgr_priv.h
index 7ac8db2..34938fa 100644
--- a/fs_mgr/fs_mgr_priv.h
+++ b/fs_mgr/fs_mgr_priv.h
@@ -73,12 +73,8 @@
 #define MF_ZRAMSIZE     0x100
 #define MF_VERIFY       0x200
 #define MF_FORCECRYPT   0x400
-/*
- * There is no emulated sdcard daemon running on /data/media on this device,
- * so treat the physical SD card as the only external storage device,
- * a la the Nexus One.
- */
-#define MF_NOEMULATEDSD 0x400
+#define MF_NOEMULATEDSD 0x800 /* no emulated sdcard daemon, sd card is the only
+                                 external storage */
 
 #define DM_BUF_SIZE 4096