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This implements support for UEFI secure variable storage
using standalone MM framework on qemu_sbsa platform.

Non-secure shared memory between UEFI and standalone MM
is allocated at the top of DRAM.
DRAM size of qemu_sbsa varies depends on the QEMU parameter,
so the non-secure shared memory is allocated by trusted firmware
and passed the base address and size to UEFI through device tree
"/reserved-memory" node.

Change-Id: I367191f408eb9850b7ec7761ee346b014c539767
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>

Enable the spm_mm framework for the qemu_sbsa platform.
Memory layout required for spm_mm is created in secure SRAM.
Co-developed-by: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Change-Id: I104a623e8bc1e44d035b95f014a13b3f8b33a62a