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

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

Turn the SC_* 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 9017a24..79c6c10 100644
--- a/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
+++ b/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
@@ -22,9 +22,9 @@
 
 	writel(1, sg_base + SG_LOADPINCTRL);
 
-	tmp = readl(SC_CLKCTRL);
+	tmp = readl(sc_base + SC_CLKCTRL);
 	tmp |= SC_CLKCTRL_CEN_PERI;
-	writel(tmp, SC_CLKCTRL);
+	writel(tmp, sc_base + SC_CLKCTRL);
 
 	return DIV_ROUND_CLOSEST(UNIPHIER_PRO4_UART_CLK, 16 * CONFIG_BAUDRATE);
 }