drm/i915/bdw+: Move misc display IRQ handling to it own function

Just moving it to reduce the tabs and avoid break code lines.
No behavior changes intended here.

v2:
- Reading misc display IRQ outside of gen8_de_misc_irq_handler() as
other irq handlers (Dhinakaran)

Cc: Dhinakaran Pandiyan <[email protected]>
Reviewed-by: Dhinakaran Pandiyan <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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