Revert "vold: allow override of MAX_PARTITIONS for devices with > 4 partitions"

This reverts commit ced59a98a91d619c1feb9d47dbcc2f3acb4694db.
vold: allow override of MAX_PARTITIONS for devices with > 32 partitions
Default was updated to 32 and the error messages were changed to be less cryptic.
Change-Id: Iec4de6e7e5ad52a6dfa45952bb19104f500d9c58a
(cherry picked from commit cb80fef89874cb2833f93e7c6f0da214467e96b8)
Conflicts:
Android.mk
Change-Id: I244f48c576af05b6569c8c40ebeb4ed1bfa53469