scsi: ufs-qcom: Dump bus test and PHY registers only if sleep is allowed

Dumping bus test and PHY registers needs to sleep a bit intermittently as
there are too many of them. Skip them if it is called from contexts where
sleep is not allowed.

Change-Id: Ia6b77a66095b72749e2ee85a2d97fb9608867a0b
Signed-off-by: Can Guo <cang@codeaurora.org>