The site-specific OOM messages are unnecessary because they duplicate the
MM subsystem generic OOM message.  This patch fixes the following
checkpatch warning:

  WARNING: Possible unnecessary 'out of memory' message
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>