The Gemini PCI 'interrupt-map' does not vary by board, so let's move
the definition to a common location. This avoids having incomplete
interrupt properties (i.e. #interrupt-cells without interrupt-map).

Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>