feat(qemu-sbsa): configure GPT based on system RAM

The amount of memory supported by the SBSA platform is dynamic
and dependent on user input.  Since the configuration of the GPT
needs to reflect the system memory, QEMU_PAS_NS0 needs to be set
based on the information found in the device tree.

Change-Id: I5d1411ac00020b7b38a652ba2904c8a70fa64d18
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
1 file changed