Revert "mmc: core: sdio: added core function of suspend/resume"

This reverts commit 8aba51c17d06d5fb01485d4f24464abb56325e9e.
mm: Added dynamic writeback (again!)

So i did some research and before this patch the wirteback
deamon flushes every 600 ms dirty pages. With this patch
it flashes only every second while screen is on and every 300
ms while screen is off. Also the expire_interval changes dynamically.

Change-Id: I579e91db4c73898f30a59b7648d83767d1031296