drm/ast: Use managed interfaces for framebuffer write combining

Replace arch_phys_wc_add() and arch_io_reserve_memtype_wc() with
the rsp managed functions. Allows for removing the cleanup code
for memory management

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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