zram: remove old private project comment

(cherry pick from commit 49061236a9c2e18b31617cef10d27ba136068bac)

Remove the old private compcache project address so upcoming patches
should be sent to LKML because we Linux kernel community will take care.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Bug: 24810447
Change-Id: I00c2876712ef4c65e8b0cd2f77774d617048268f