Revert "ramdisk_kk: zRAM: only read one page at a time"

This reverts commit a3b33d13222dadb8e1f3a654e1b47e6dac51c8da.
ramdisk_stock: for aries branch from cm-11-20140323-NIGHTLY
ramdisk_kk: update from cm-11-20140323-NIGHTLY