struct fsd_ufs_drvs is not used outside this file, so make it static.  This
fixes sparse warning:

drivers/ufs/host/ufs-exynos.c:1721:28: sparse: sparse:
symbol 'fsd_ufs_drvs' was not declared. Should it be static?

Link: https://lore.kernel.org/r/20220811161053.54081-1-alim.akhtar@samsung.com
Fixes: 216f74e8 ("scsi: ufs: host: ufs-exynos: Add support for FSD UFS HCI")
Reported-by: Nkernel test robot <lkp@intel.com>
Reviewed-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NAlim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>