[ARM] pxa: add apmu clock support in mmp

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/arch/arm/mach-mmp/clock.h b/arch/arm/mach-mmp/clock.h
index ed967e7..eefffbe 100644
--- a/arch/arm/mach-mmp/clock.h
+++ b/arch/arm/mach-mmp/clock.h
@@ -25,6 +25,7 @@
 };
 
 extern struct clkops apbc_clk_ops;
+extern struct clkops apmu_clk_ops;
 
 #define APBC_CLK(_name, _reg, _fnclksel, _rate)			\
 struct clk clk_##_name = {					\