feat(qemu-sbsa): handle GIC base

QEMU provides GIC information in DeviceTree (on platform version 0.1+).
Read it and provide to next firmware level via SMC.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Change-Id: I383919bd172acc8873292a0c5e4469651dc96fb9
4 files changed