xen/arm: initialize grant_table on ARM
Initialize the grant table mapping at the address specified at index 0
in the DT under the /xen node.
After the grant table is initialized, call xenbus_probe (if not dom0).
Changes in v2:
- introduce GRANT_TABLE_PHYSADDR;
- remove unneeded initialization of boot_max_nr_grant_frames.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
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