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/debug-uart/debug-uart-pro4.c b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
index 0d66299..9017a24 100644
--- a/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
@@ -20,7 +20,7 @@
 	sg_set_iectrl(0);
 	sg_set_pinsel(128, 0, 4, 8);	/* TXD0 -> TXD0 */
 
-	writel(1, SG_LOADPINCTRL);
+	writel(1, sg_base + SG_LOADPINCTRL);
 
 	tmp = readl(SC_CLKCTRL);
 	tmp |= SC_CLKCTRL_CEN_PERI;