Revert "ext4: Send notifications on error"

This reverts commit 9760c6ce which is
commit 9a089b21 upstream.

It breaks the build due to other patches not being backported, so revert
it as it is not needed in an Android kernel.

Fixes: 9760c6ce ("ext4: Send notifications on error")
Change-Id: I95da56bf79ffde03437bc20f9b6435554d3cdb32
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>