Revert "staging: zram: Rate limit memory allocation errors"

This reverts commit 89198200.

This is a preparation change for android-4.9.124 upmerge.

The code, which is changed by this patch, was removed in
android-4.9.124 (by Google) with:

f61c5394 UPSTREAM: zram: partial IO refactoring

Change-Id: I65c2d1c76ad25575defd5320960803b9c90a28bb
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>