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Increase SHARED_RAM_SIZE in sbsa_qemu platform from 4KB to 8KB.

sbsa_qemu uses SHARED_RAM for mail box and hold state of each cpus. If
qemu is configured with 512 cpus, region size used by qemu is greater
than 4KB.
Signed-off-by: Masato Fukumori <masato.fukumori@linaro.org>
Change-Id: I639e44e89335249d385cdc339350f509e9bd5e36