uniphier: make PSCI related base address configurable

The register base address will be changed in the next SoC. Make it
configurable.

Change-Id: Ibe07bd9db128b0f7e629916cb6ae21ba7984eca9
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/plat/socionext/uniphier/uniphier.h b/plat/socionext/uniphier/uniphier.h
index f8aa65a..b26bd65 100644
--- a/plat/socionext/uniphier/uniphier.h
+++ b/plat/socionext/uniphier/uniphier.h
@@ -69,6 +69,8 @@
 void uniphier_gic_cpuif_disable(void);
 void uniphier_gic_pcpu_init(void);
 
+void uniphier_psci_init(unsigned int soc);
+
 unsigned int uniphier_calc_core_pos(u_register_t mpidr);
 
 #endif /* UNIPHIER_H */