msm: mdss: handle WB2 irq changes for MDSS 1.8.0 for WFD case

In MDSS 1.8.0 WB2 intr status and intr enable bits has changed.
Handle this case only for WFD scenario as code path is common
for both WFD and rotator and it is affecting rotator use cases.

Change-Id: Id366bb2f3a7ac7b4195193c71d5823eeb152a315
Signed-off-by: Radhika Ranjan Soni <rrsoni@codeaurora.org>