update zram according to kernel 3.13

N/A
-original zram implementation dependens on X86 arch

Change-Id: I95178021dcf005270d34b428556c70fcf6baa958
Signed-off-by: Qiu Feng <qiufeng@xiaomi.com>
enable zram feature

N/A

Signed-off-by: Qiu Feng <qiufeng@xiaomi.com>
change zram device from 1 to 4

Change-Id: Id2682dbad90ed637b3bba11eb82930dc86537787

Signed-off-by: Qiu Feng <qiufeng@xiaomi.com>