irqchip: crossbar: Introduce ti, max-crossbar-sources to identify valid crossbar mapping

Currently we attempt to map any crossbar value to an IRQ, however,
this is not correct from hardware perspective. There is a max crossbar
event number upto which hardware supports. So describe the same in
device tree using 'ti,max-crossbar-sources' property and use it to
validate requests.

[ jac - remove MAX_SOURCES from binding doc, use integer because we
shouldn't put implementation details in the binding docs ]

Signed-off-by: Nishanth Menon <[email protected]>
Signed-off-by: Sricharan R <[email protected]>
Acked-by: Santosh Shilimkar <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jason Cooper <[email protected]>

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