Revert "Add zram for android optimization"

This reverts commit 5fec809dcf383a1b0689a112e4b8cb73d69bca80.

Conflicts:
	drivers/staging/zram/Kconfig
	drivers/staging/zram/zram_drv.c
	drivers/staging/zram/zram_drv.h
	drivers/staging/zram/zram_sysfs.c
Conflicts forgot to revert
Add ZRAM_FOR_ANDROID, with all of the bits
zram_sysfs: num_devices was renamed to zram_num_devices
zram: forgot to fix the name of zram_num_devices in zram_drv.h
zram: last time
fix zram_for_android compiling