drm: bridge: lt9611uxc: add check to read edid in detect callback

In detect callback, edid is read before interrupt is triggered,
resulting in incorrect edid info. In case of cont. splash
enabled, as bridge init is already done, edid is read in detect
callback giving accurate values. So, read edid in
detect callback only if cont_splash_en is set.

Change-Id: I9f14910757a122d81b6080169eaef2fb0e010333
Signed-off-by: Sai Srujana Oruganti <quic_osaisruj@quicinc.com>