UPSTREAM: scsi: ufs-mediatek: Enable WriteBooster capability

Enable WriteBooster capability on MediaTek UFS platforms.

Link: https://lore.kernel.org/r/20200508080115.24233-8-stanley.chu@mediatek.com


Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Bug: 151050916
(cherry picked from commit 29060a629135a00414d6ea3fbb246a114898f4be)
Change-Id: I1c5879a0601b38c2402b20c7a2e1f21d818f0987
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>