genirq: Introduce IRQD_CAN_RESERVE flag

Add a new flag to mark interrupts which can use reservation mode. This is
going to be used in subsequent patches to disable reservation mode for a
certain class of MSI devices.

Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Alexandru Chirvasitu <[email protected]>
Tested-by: Andy Shevchenko <[email protected]>
Cc: Dou Liyang <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Cc: Mikael Pettersson <[email protected]>
Cc: Josh Poulson <[email protected]>
Cc: Mihai Costache <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: [email protected]
Cc: Haiyang Zhang <[email protected]>
Cc: Dexuan Cui <[email protected]>
Cc: Simon Xiao <[email protected]>
Cc: Saeed Mahameed <[email protected]>
Cc: Jork Loeser <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: [email protected]
Cc: KY Srinivasan <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Sakari Ailus <[email protected]>,
Cc: [email protected]

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