ARM: dts: spear13xx: Drop malformed 'interrupt-map' on PCI nodes

The spear13xx PCI 'interrupt-map' property is not parse-able.
'#interrupt-cells' is missing and there are 3 #address-cells. Based on the
driver, the only supported interrupt is for MSI. Therefore, 'interrupt-map'
is not needed.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20211022141156.2592221-1-robh@kernel.org

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>