ARM: uniphier: de-couple SG macros into base address and offset

The SG_* macros represent the address of SoC-glue registers.
For a planned new SoC, its base address will be changed.

Turn the SG_* macros into the offset from the base address.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/memconf.c b/arch/arm/mach-uniphier/memconf.c
index 8105368..f69b489 100644
--- a/arch/arm/mach-uniphier/memconf.c
+++ b/arch/arm/mach-uniphier/memconf.c
@@ -140,7 +140,7 @@
 	}
 
 out:
-	writel(val, SG_MEMCONF);
+	writel(val, sg_base + SG_MEMCONF);
 
 	return 0;
 }