ARM i.MX: Add common clock support for pllv2

This PLL is found on i.MX51 and i.MX53

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-imx/clk.h b/arch/arm/mach-imx/clk.h
index 8a4aee6..7f5da75 100644
--- a/arch/arm/mach-imx/clk.h
+++ b/arch/arm/mach-imx/clk.h
@@ -8,6 +8,9 @@
 struct clk *imx_clk_pllv1(const char *name, const char *parent,
 		void __iomem *base);
 
+struct clk *imx_clk_pllv2(const char *name, const char *parent,
+		void __iomem *base);
+
 static inline struct clk *imx_clk_fixed(const char *name, int rate)
 {
 	return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);