msm: mdss: avoid DSI FIFO errors during dynamic refresh operation

When dynamic refresh operation is under progress, it is sometimes
expected that the DSI h/w throws DSI FIFO underflow errors. Avoid
throwing DSI FIFO errors on console for this case. Just clear the
DSI error interrupt and do not trigger the DSI underflow recovery
process.

Change-Id: I03b8764397378104981c1a5a6e627e90f53222ee
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>