UPSTREAM: zram: rename struct `table' to `zram_table_entry'

(cherry-pick from commit cb8f2eec3c5c87e31219c5e58625b8e890004e48)

Andrew Morton has recently noted that `struct table' actually represents
table entry and, thus, should be renamed.  Rename to `zram_table_entry'.

Bug: 25951511

Change-Id: I862e174bb6d5241ecfd950bc992f41da83dfaff5
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Weijie Yang <weijie.yang@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>