drm/ast: Rework definition of I/O read and write helpers

Ast defines a number of I/O helpers for accessing hardware. Only 4 of
the many generated functions are actually used. Replace the respective
generator macros with those 4 functions. No functional changes.

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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