msm: mdss: skip software underrun recovery for split display

Commit cb78c355b9225b815302c721b8f410168cba4a84 ("msm:
mdss: Issue ctl sw reset when underrun happens") enables the
software underrun recovery for split display cases due to
hardware limitation. This limitation is not applicable to
8994, 8996 and all upcoming targets. This change skips the
recovery path when hardware supports it.

Change-Id: I09e17bb50749ea5a0ec32ed604adab7126434e59
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>