Revert "drm/i915: use localized __diag_ignore_all() instead of per file"

This reverts commit 88e9664434c994e97a9f6f8cdd1535495c660cea.

__diag_ignore_all() only works for GCC 8 or later.

-Woverride-init (from -Wextra, enabled in i915 Makefile) combined with
CONFIG_WERROR=y or W=e breaks the build for older GCC.

With i386_defconfig and x86_64_defconfig enabling CONFIG_WERROR=y by
default, we really need to roll back the change.

An alternative would be to disable -Woverride-init in the Makefile for
GCC <8, but the revert seems like the safest bet now.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8768
Reported-by: John Garry <[email protected]>
References: https://lore.kernel.org/r/[email protected]
References: https://lore.kernel.org/r/[email protected]
Fixes: 88e9664434c9 ("drm/i915: use localized __diag_ignore_all() instead of per file")
Cc: Gustavo Sousa <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Reviewed-by: Gustavo Sousa <[email protected]>
Tested-by: John Garry <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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