genirq: Generic chip: Add linear irq domain support

Provide infrastructure for irq chip implementations which work on
linear irq domains.

- Interface to allocate multiple generic chips which are associated to
  the irq domain.

- Interface to get the generic chip pointer for a particular hardware
  interrupt in the domain.

- irq domain mapping function to install the chip for a particular
  interrupt.

Note: This lacks a removal function for now.

[ Sebastian Hesselbarth: Mask cache and pointer math fixups ]

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Russell King - ARM Linux <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Jean-Francois Moine <[email protected]>
Cc: [email protected]
Cc: Rob Herring <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Gregory Clement <[email protected]>
Cc: Gerlando Falauto <[email protected]>
Cc: Rob Landley <[email protected]>
Acked-by: Grant Likely <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Ezequiel Garcia <[email protected]>
Cc: [email protected]
Cc: Sebastian Hesselbarth <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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