This patch introduces Exynos UFS host controller driver which mainly
handles vendor-specific operations including link startup, power mode
change and hibernation/unhibernation.

[robot: drivers/scsi/ufs/ufs-exynos.c:931:8-10:
 WARNING: possible condition with no effect (if == else)
]

Link: https://lore.kernel.org/r/20200528011658.71590-10-alim.akhtar@samsung.comReported-by: Nkbuild test robot <lkp@intel.com>
Reported-by: NJulia Lawall <julia.lawall@lip6.fr>
Tested-by: NPaweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Reviewed-by: NKiwoong Kim <kwmad.kim@samsung.com>
Reviewed-by: NAvri Altman <avri.altman@wdc.com>
Signed-off-by: NSeungwon Jeon <essuuj@gmail.com>
Signed-off-by: NAlim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>