Update zsmalloc to Linux kernel 3.11
mm: Rename function "reset_page_mapcount" to "page_mapcount_reset"

In order to accomodate changes from backported (from kernel 3.11) subsystems, this function needs to be renamed.
Update frontswap to Linux kernel 3.11
Update zcache to Linux kernel 3.11

Conflicts:
	drivers/staging/zcache/Makefile
	drivers/staging/zcache/zbud.c
Adapt to backported frontswap mechanism
Adapt zram to zsmalloc from kernel 3.11

Conflicts:
	drivers/staging/zram/zram_drv.c