scsi: ufs: Inject errors to verify error handling

Use fault-injection framework to simulate error conditions
in the controller and verify error handling mechanisms
implemented in UFS host controller driver.

This is used only during development and hence
guarded by CONFIG_UFS_FAULT_INJECTION debug config option.

Change-Id: Ia63c276c5e56d677a92332b42b670300ad82af7a
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>