scsi: ufs: Allow secondary ufs storage device to probe

Currently we are returning ENODEV if the device is not
boot device. In few targets, we have extra UFS device
for storage purposes. Allow secondary UFS probing.

Change-Id: I67f1f84227292ba18157142171acc4757432c318
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>