ARM: mvebu: Use macros for interrupt flags on Armada 38x sdhci node

Instead of hardcoding the values of the interrupt flags, use the
macros provided by <include/dt-bindings/interrupt-controller/irq.h>
and <include/dt-bindings/interrupt-controller/arm-gic.h> for the
Armada 38x SDHCI node.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>