xen-usb: do not reference PAGE_SIZE
PAGE_SIZE is undefined on ARM64. Use XC_PAGE_SIZE instead, which is always 4096 even when page granularity is 64K. For this to actually work with 64K pages, more changes are required. Signed-off-by: NStefano Stabellini <sstabellini@kernel.org> Reviewed-by: NJuergen Gross <jgross@suse.com> Release-acked-by: NWei Liu <wei.liu2@citrix.com>
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