vold2: Refactor FAT support into a separate class

Signed-off-by: San Mehat <san@google.com>
diff --git a/Android.mk b/Android.mk
index 564338e..b9e63c7 100644
--- a/Android.mk
+++ b/Android.mk
@@ -21,7 +21,8 @@
                   DirectVolume.cpp                     \
                   logwrapper.c                         \
                   ProcessKiller.c                      \
-                  geom_mbr_enc.c
+                  geom_mbr_enc.c                       \
+                  Fat.cpp
 
 LOCAL_MODULE:= vold