scsi: ufs: created UFS unit-tests framework

Created a new UFS block device test framework.
This test includes:
- Basic read after write command
- Random buffer length
- Ability to run test multiple times

Change-Id: I06fe7bf7d325037d6039a4acfdfb9c2c8960a435
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>