synquacer: Add MHU driver

Add Message Handling Unit (MHU) driver used to communicate among
Application Processors (AP) and System Control Processor (SCP).

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
diff --git a/plat/socionext/synquacer/sq_bl31_setup.c b/plat/socionext/synquacer/sq_bl31_setup.c
index 1d3d3b6..4d7c851 100644
--- a/plat/socionext/synquacer/sq_bl31_setup.c
+++ b/plat/socionext/synquacer/sq_bl31_setup.c
@@ -125,6 +125,9 @@
 
 	/* Allow access to the System counter timer module */
 	sq_configure_sys_timer();
+
+	/* Initialize power controller before setting up topology */
+	plat_sq_pwrc_setup();
 }
 
 void bl31_plat_runtime_setup(void)