scsi: ufs: Increase fDeviceInit flag poll time to 5sec

Few UFS devices are taking a long time to finish its internal
initialization. UFS driver polls fDeviceInit flag which indicates
device initialization completion.

Increase this flag poll time to 5sec to cover support for those UFS
devices as well.

Change-Id: I99e1ed54d57c9fd75bbe1b22ea30553b1ce0fb83
Signed-off-by: Hiren Gohel <vhiren@codeaurora.org>