Replace hard-coded interrupt parts (GIC, flags) with standard defines
for readability.  No changes in resulting DTBs.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>