video/xen-fbfront: Further s/MFN/GFN clean-up
The PV driver xen-fbfront is only dealing with GFN and not MFN. Rename all the occurence of MFN to GFN. Also take the opportunity to replace to usage of pfn_to_gfn by xen_page_to_gfn. Signed-off-by: NJulien Grall <julien.grall@citrix.com> Reviewed-by: NDavid Vrabel <david.vrabel@citrix.com> Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
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