BACKPORT: scsi: ufs-mediatek: Add inline encryption support

Add inline encryption support to ufs-mediatek.

The standards-compliant parts, such as querying the crypto capabilities and
enabling crypto for individual UFS requests, are already handled by
ufshcd-crypto.c, which itself is wired into the blk-crypto framework.

However MediaTek UFS host requires a vendor-specific hce_enable operation
to allow crypto-related registers being accessed normally in kernel.  After
this step, MediaTek UFS host can work as standard-compliant host for
inline-encryption related functions.

Link: https://lore.kernel.org/r/20200712003226.7593-1-stanley.chu@mediatek.com


Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Bug: 166747994
[ Resolved minor conflict in drivers/scsi/ufs/ufs-mediatek.c ]
(cherry picked from commit 46426552e74fd38e43aa95af17487d3cc285d71f)
Change-Id: I47629ab3823e361e4cf778c08ffd1c6b1a1d6e06
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>