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This allows PSCI in TF-A to signal platform power states to QEMU
via a controller in secure space.

This required a sbsa-ref specific version of PSCI functions for the
platform. Also adjusted the MMU range to also include the new EC.

Add a new MMU region for the embedded controller and increase the
size of xlat tables by one for the new region.
Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Change-Id: Iece8a88947f11e82ab8988e460a8a66ad175a5ee

sbsa-ref in QEMU creates clusers of 8 cores, it may create up to 512
cores in upto 64 clusters. Implement a qemu_sbsa specific topology file
and increase the BL31_SIZE to accommodate the bigger table sizes. Change
platform_def.h for new topology. Correct PLATFORM_CPU_PER_CLUSTER_SHIFT so
plat_helpers.S calculates correct result.
Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Change-Id: Idc5d70394c0956b759ad2c86f9fda8f293f2cfa7