soc: qcom: mem-offline: Ignore hotplug notification for other blocks

Other blocks that don't belong to mem-offline can still be offlined and
onlined if their 'removable' is set. This will call our notifier registered
to this driver. We don't want to do any AOP notification or record stats
for blocks that don't belong to mem-offline. Hence, just log the action on
those blocks and avoid performing any further actions.

Change-Id: I2adc128dfc099c908f67075fdd10e6520533dc5c
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>