[PATCH] intel-dri: Fix initialization if startup happens in interlaced mode [v2]

[Christian Schmidt]

My EFI BIOS starts the graphics card up in my projector's preferred EDID
mode, 1080 at 60i. The Intel driver does not clear the interlaced bit:

#define   PIPECONF_PROGRESSIVE  (0 << 21)
#define   PIPECONF_INTERLACE_W_FIELD_INDICATION (6 << 21)
#define   PIPECONF_INTERLACE_FIELD_0_ONLY               (7 << 21)

This patch introduces a new PIPECONF_INTERLACE_MASK define and uses it
to restore progressive mode.

Signed-of-by: Christian Schmidt <schmidt at digadd.de>

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