watchdog: imx: use clk_get to acquire the watchdog clock

Use clk_get to acquire the watchdog clock and also avoid hardcoding the clock name.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/plat-mxc/system.c b/arch/arm/plat-mxc/system.c
index c3972c5..3455fc0 100644
--- a/arch/arm/plat-mxc/system.c
+++ b/arch/arm/plat-mxc/system.c
@@ -55,7 +55,7 @@
 	} else {
 		struct clk *clk;
 
-		clk = clk_get_sys("imx-wdt.0", NULL);
+		clk = clk_get_sys("imx2-wdt.0", NULL);
 		if (!IS_ERR(clk))
 			clk_enable(clk);
 		wcr_enable = (1 << 2);