Revert "mm: writeback: every 500ms the writeback daemon kicks in and flushes the dirty pages into disk. Thats not very pleasant for performance and *maybe* battery. This patch disables the writeback function while the screen is on, and enables it back when the screen is off to flush all the dirty pages. In my real world usage testing I notice a slight bump in smoothness and performance while using the device."

This reverts commit bff4257b787f62f62dc9a31a26218e539b9d9eb8.
add fiops and sio schedulers

Conflicts:
	block/Kconfig.iosched
	block/Makefile
	block/sio-iosched.c
arm/crypto: Add optimized AES and SHA1 routines

Conflicts:
	arch/arm/Makefile
	crypto/Kconfig