zram: remove old private project comment

zram: remove old private project comment

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>
(cherry picked from commit 49061236a9c2e18b31617cef10d27ba136068bac)
Signed-off-by: Alex Shi <alex.shi@linaro.org>