Extend the maximum number of partitions from 4 to 32

Some platforms needs more than 4 partitions, e.g. the lt26.

Change-Id: Id22125313824b0ae15a4596709f52c4ab609a542
diff --git a/DirectVolume.h b/DirectVolume.h
index de1ed8b..c0139d4 100644
--- a/DirectVolume.h
+++ b/DirectVolume.h
@@ -27,7 +27,7 @@
 
 class DirectVolume : public Volume {
 public:
-    static const int MAX_PARTITIONS = 4;
+    static const int MAX_PARTITIONS = 32;
 protected:
     PathCollection *mPaths;
     int            mDiskMajor;
@@ -37,7 +37,7 @@
     int            mOrigDiskMinor;
     int            mOrigPartMinors[MAX_PARTITIONS];
     int            mDiskNumParts;
-    unsigned char  mPendingPartMap;
+    unsigned int   mPendingPartMap;
     int            mIsDecrypted;
     int            mFlags;