drm/msm/sde: add cwb support for single ctl path

MDSS hardware supports single CTL path starting SM8150 chipset.
It needs mux configuration update starting for this hardware due
to single CTL path. Change also includes ping-pong overflow irq
handling for the additional ping-pong blocks in SM8150.

Change-Id: I3f2ba272562b7f0967621b3b6aa029ef501b02db
Signed-off-by: Prabhanjan Kandula <pkandula@codeaurora.org>