ARM: mach-dove: fix legacy get_irqnr_and_base

[Jason Cooper]

On Sun, Nov 22, 2015 at 10:40:03PM -0500, Nicolas Pitre wrote:
> Commit 5d6bed2a9c ("ARM: dove: fix legacy dove IRQ numbers") shifted
> IRQ numbers by one but didn't update the get_irqnr_and_base macro
> accordingly.  This macro is involved when CONFIG_MULTI_IRQ_HANDLER
> is not defined.
> 
> Signed-off-by: Nicolas Pitre <nico at linaro.org>

Applied to mvebu/fixes with minor tweak to the subject line.  Also,
flagged for stable back to v4.2.

thx,

Jason.