vold: Support internal storage partitions

 * Support nonremovable disks and expose a nonremovable flag in the
   DiskCreated message.
 * New DiskPartition class to hold single partitions.  DiskPartition is
   used when the fs_mgr entry has a partnum (eg. when fs_mgr_flags
   contains voldmanaged=label:#).  Override disk partitioning methods
   to prevent destroying the emmc.

Change-Id: Id7ec3ea409b5c96e691730604e4b1e9cc3aa9d33

vold: Correct base header paths

These headers were moved to android-base

Change-Id: I3eaa8316006b9017c5f5e31cd1e91efc2862106d

DiskPartition.cpp: Add sysmacros.h dependency for major/minor

Change-Id: I22c267c8f12b40fb3e2295becd88f12b75907b69
Signed-off-by: Adrian DC <radian.dc@gmail.com>

[mikeioannina] Adapt for Pie and Q

Change-Id: Id7ec3ea409b5c96e691730604e4b1e9cc3aa9d33