drm/ast: Init iosys_map pointer as I/O memory for damage handling

Ast hardware scans out the primary plane from video memory, which
is in I/O-memory space. Hence init the damage handler's iosys_map
pointer as I/O memory.

Not all platforms support accessing I/O memory as system memory,
although it's usually not a problem in ast's x86-based systems.

The error report is at [1].

Reported-by: kernel test robot <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Jocelyn Falempe <[email protected]>
Fixes: f2fa5a99ca81 ("drm/ast: Convert ast to SHMEM")
Cc: Thomas Zimmermann <[email protected]>
Cc: Jocelyn Falempe <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/lkml/[email protected]/T/#u # 1
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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