IsoRec: Isolated Recovery for the Exynos 4210 family

IsoRec aims to be a standard by which the monolithic kernel/recovery binaries
of the S2 family of devices can invoke an alternate recovery optionally flashed
separately by the user.

The alternate recovery is flashed to the RECOVERY partition (/dev/block/mmcblk0p6),
a seemingly vestigial partition without any real use. Only the lzop-compressed,
cpio-formatted recovery ramdrive is stored there; the standard kernel image is
used to run this recovery. The lzop-compressed image of the ramdrive is stored
raw in the RECOVERY partition.

Behavior of patch:
-skip all this if not booting into recovery.
-if the raw recovery partition contains valid lzop-compressed data,
-and if said data is a valid cpio archive,
-then use that cpio archive as the recovery ramdrive;
-else use the default recovery ramdrive bundled with the kernel.

More information here:
http://forum.xda-developers.com/galaxy-s2/orig-development/isorec-isolated-recovery-galaxy-s2-t3291176

Change-Id: I2fa1b764b52915262374124ea28f5a2585314891

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