uniphier: pass SCP base address as a function parameter

Currently, UNIPHIER_SCP_BASE is hard-coded in uniphier_scp_start(),
which is not handy for PIE.

Towards the goal of making this really position-independent, pass in
image_info->image_base.

Change-Id: I88e020a1919c607b1d5ce70b116201d95773bb63
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/plat/socionext/uniphier/uniphier.h b/plat/socionext/uniphier/uniphier.h
index 6ccd422..698f3eb 100644
--- a/plat/socionext/uniphier/uniphier.h
+++ b/plat/socionext/uniphier/uniphier.h
@@ -48,7 +48,7 @@
 struct image_info *uniphier_get_image_info(unsigned int image_id);
 
 int uniphier_scp_is_running(void);
-void uniphier_scp_start(void);
+void uniphier_scp_start(uint32_t scp_base);
 void uniphier_scp_open_com(void);
 void uniphier_scp_system_off(void);
 void uniphier_scp_system_reset(void);