Support drvInfo for NDArray callbacks

[MarkRivers]

We have been assuming that the drvInfo field for NDArrays is ARRAY_DATA, i.e. that pasynUser->reason=0. Plugins provide PVs to specify the portName, and addr, but not the drvInfo field.

In the case of the NDPluginStats plugin when it does NDArray callbacks of time-series callbacks (using doCallbacksGenericPointer) it would have been more logical to use a new drvInfo field, like ND_STATS_TIME_SERIES. Since there was no easy way to do this, and have it visible in OPI screens, I instead used ADDR=1 for these callbacks, and ADDR=0 for the default NDArray callbacks of the input array with possibly modified NDAttributes.

This change would not be difficult, it just means adding a new record to NDPluginDriver and adding that field to the plugin "more" screen.