drm/xe: Add helpers for manipulating macro arguments

Define generic helpers that will replace private definitions used
by the RTP code and will allow reuse by the new code.

Put them in new xe_args.h file (instead of infamous xe_macros.h)
as once we find more potential users outside of the Xe driver we
may want to move all of these macros as-is to linux/args.h.

Signed-off-by: Michal Wajdeczko <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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