arm: davinci: Use generic irq chip

[Kevin Hilman]

Thomas Gleixner <tglx at linutronix.de> writes:

> Simple conversion which simply uses the fact that the second irq chip
> base address has offset 0x04 to the first one.
>
> Signed-off-by: Thomas Gleixner <tglx at linutronix.de>

For davinci changes:

Reviewed-and-Tested-by: Kevin Hilman <khilman at ti.com>