[PATCH V2] xen: event channel arrays are xen_ulong_t and notunsigned long

[Ian Campbell]

The following two patches (one for Xen, one for Linux) switch Xen event
channels from unsigned long to xen_ulong_t.

On arm, this enables us to have the same interface on arm32 and arm64
because xen_ulong_t is a 64-bit type on ARM.

On x86 there is no change because xen_ulong_t is unsigned long on x86.

Since this is an ABI change on ARM I hope we can get this in for the 3.9
merge window. I have deferred the other changes which I previously
posted along side this since they are not so critical.

Ian.

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