drm/i915: Correct max delay for HDMI hotplug live status checking

The total delay of HDMI hotplug detecting with 30ms have already
been split into a resolution of 3 retries of 10ms each, for the worst
cases. But it still suffered from only waiting 10ms at most in
intel_hdmi_detect(). This patch corrects it by reading hotplug status
with 4 times at most for 30ms delay.

v2:
- straight up to loop execution for more clear in code readability
- mdelay will replace with msleep by Daniel's new patch

	drm/i915: mdelay(10) considered harmful

- suggest to re-evaluate try times for being compatible to old HDMI monitor

Reviewed-by: Cooper Chiou <[email protected]>
Tested-by: Gary Wang <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Gavin Hindman <[email protected]>
Cc: Sonika Jindal <[email protected]>
Cc: Shashank Sharma <[email protected]>
Signed-off-by: Gary Wang <[email protected]>
[danvet: fixup conflict with s/mdelay/msleep/ patch.]
Cc: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>

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