qemu/qemu_sbsa: spm_mm supports 512 cores

sbsa-ref in QEMU may create up to 512 cores.
This commit prepares the MP information to support 512 cores.
The number of xlat tables for spm_mm is also increased.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Change-Id: I2788eaf6d14e188e9b5d1102d359b2899e02df7c
2 files changed