ANDROID: GKI: revert part of the ufshcd_* export removals

Turns out that not all UFS drivers are in the tree, so some vendors
still need these, so add them back for them to use.  Also remove
building in CONFIG_SCSI_UFS_QCOM as the in-kernel driver is quite out of
date.

Bug: 157965270
Reported-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Id105edff00f77af43fec664a39e0c7b97779f92c