p1-common: add lvm support [2/3]

add back /data to onenand
add lvm for system and data
increase /system to 800M

used aries/crespo devices as example

Dependencies:

1. https://gerrit.omnirom.org/#/c/6959/ 
3. https://gerrit.omnirom.org/#/c/6961/

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: If5967343e24f31fc012350d6d1d36d2185e66774