BACKPORT: FROMLIST: scsi: core: Reserve one tag for the UFS driver

This is a GKI-compatible version of the following patch: "scsi: core:
Add support for reserved tags".

Bug: 205080886
Link: https://lore.kernel.org/linux-scsi/20211103000529.1549411-2-bvanassche@acm.org

.
Change-Id: I6273114ae8cc6c2a74c72f7bc090eb0319ec5772
Signed-off-by: Bart Van Assche <bvanassche@google.com>