scsi: ufs: Kconfig fix

Currently if we have PCI and UFSHCD configured in the kernel, both
SCSI_UFS_DWC_TC_PCI and SCSI_UFSHCD_PCI show up, which is not correct.
This patch changes the UFS Kconfig to assure hierarchy between the 2
options.

Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>