feat(qemu_sbsa): handle GIC ITS address

Read data from DeviceTree provided by QEMU, provide via SMC
to the next firmware level.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Change-Id: I95c5f00ab2cca3b5fda122dcc8d7704a7a82059b
1 file changed