[IA64] override for pgd_addr_end to step around holes

Every user region has a hole in the middle where we don't have
enough bits in pgd+pmd+pte so pgd_addr_end needs some extra math
to compute the virtual address base of the next pgd entry.

Thanks to Dave Miller for pointing me in the right direction.

Signed-off-by: Tony Luck <tony.luck@intel.com>

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