qemu/qemu_sbsa: add support for sbsa-ref Embedded Controller

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
diff --git a/plat/qemu/qemu_sbsa/platform.mk b/plat/qemu/qemu_sbsa/platform.mk
index ece700c..d45f3f1 100644
--- a/plat/qemu/qemu_sbsa/platform.mk
+++ b/plat/qemu/qemu_sbsa/platform.mk
@@ -79,7 +79,7 @@
 				lib/semihosting/semihosting.c			\
 				lib/semihosting/${ARCH}/semihosting_call.S	\
 				plat/common/plat_psci_common.c			\
-				${PLAT_QEMU_COMMON_PATH}/qemu_pm.c		\
+				${PLAT_QEMU_PATH}/sbsa_pm.c			\
 				${PLAT_QEMU_PATH}/sbsa_topology.c		\
 				${PLAT_QEMU_COMMON_PATH}/aarch64/plat_helpers.S	\
 				${PLAT_QEMU_COMMON_PATH}/qemu_bl31_setup.c	\