Update LVM source tree to 2.02.98
Update prebuilt LVM binary to 2.02.98

New binary is built with compiler options which reduce size by ~300KB.
Update docs

* Document new compiler flags in HOWTO-BUILD
* Note how to get eraseblock size from sysfs in HOWTO-MOD
Add sample LVM files for maguro (GSM Galaxy Nexus)

The sample files are for a configuration with /system, /data, and /cache
all on LVs, with the corresponding partitions all being used as PVs.