irqchip: crossbar: Fix kerneldoc warning
irqchip: crossbar: Fix kerneldoc warning

Adding missing properties for kerneldoc (@write) and cleanup
of harmless warnings while we are here.

kerneldoc warnings:
Warning(drivers/irqchip/irq-crossbar.c:27): missing initial short description on line:
 * struct crossbar_device: crossbar device description
Info(drivers/irqchip/irq-crossbar.c:27): Scanning doc for struct
Warning(drivers/irqchip/irq-crossbar.c:39): No description found for parameter 'write'
2 warnings

Signed-off-by: Nishanth Menon <50c3c575ce2bb12c45e20736ce59e86fe81915b4@ti.com>
Signed-off-by: Sricharan R <7e964cecf6bff52ba5fa1fc568bce559b5864362@ti.com>
Acked-by: Santosh Shilimkar <5b4d8dc9ea337fff5fd1729321eda9873ade0b09@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-9-git-send-email-7e964cecf6bff52ba5fa1fc568bce559b5864362@ti.com
Signed-off-by: Jason Cooper <68c46a606457643eab92053c1c05574abb26f861@lakedaemon.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs