scsi: ufs: fix up ufs card detect framework

This change moves the card removal routine from card detect work to card
detect notifier. The ultimate goal is whenever a card removal event is
detected, card removal routine should kick off to clean up everything
safely so that the following card insertion event can be served properly.

Change-Id: I126b4694e248e077b906f6a10cf514bf83caf306
Signed-off-by: Can Guo <cang@codeaurora.org>