ARM: at91: clock: add PMC_PLLICPR init function

To avoid the duplicated code, add the PMC_PLLICPR init function.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Tested-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/arm/mach-at91/clock.c b/arch/arm/mach-at91/clock.c
index 5300d68..06dcbbc 100644
--- a/arch/arm/mach-at91/clock.c
+++ b/arch/arm/mach-at91/clock.c
@@ -112,3 +112,10 @@
 
 	writel(value, &pmc->usb);
 }
+
+void at91_pllicpr_init(u32 icpr)
+{
+	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+
+	writel(icpr, &pmc->pllicpr);
+}