[Intel-gfx] [patch] remove loop in Ironlake intrrupt hander

[Zou, Nanhai]

On Ironlake, there is an interrupt master control bit.
With the bit disabled before clearing IIR, we do not need to handle extra interrupt in a loop.
This patch removes the loop in Ironlake interrupt handler
It fixed irq lost issue on some Ironlake platforms.

Signed-off-by: Zou Nan hai <Nanhai.zou at intel.com>

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