adv7481: Fix Video split rendering observed on QTVinput

Stabilize adv7481 raw irq status register(IO_REG_INT_RAW_STATUS_ADDR)
read by adding delay in adv7481_irq workqueue schedule.
This resolves video split rendering when hot-unplug and hot-plug
the HDMI IN source.

CRs-Fixed: 2204762
Change-Id: Id2e86c56983318c9855cec881644552eab7810e5
Signed-off-by: Suprith Malligere Shankaregowda <supgow@codeaurora.org>