scsi: ufs: Remove ufshcd-qti driver

ufshcd-qti was a copy of the downstream driver.
It was a place-holder until we get the upstream driver
working and stable.
Now that it's done, remove ufshcd-qti.

Change-Id: Ie9a5781a5133c08cf4ebb11974fade076ec0da84
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>