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/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
index b04d54d..ed26de6 100644
--- a/arch/arm/mach-mx5/clock-mx51-mx53.c
+++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
@@ -1110,8 +1110,8 @@
 	_REGISTER_CLOCK("sdhci-esdhc-imx.1", NULL, esdhc2_clk)
 	_REGISTER_CLOCK(NULL, "cpu_clk", cpu_clk)
 	_REGISTER_CLOCK(NULL, "iim_clk", iim_clk)
-	_REGISTER_CLOCK("imx-wdt.0", NULL, dummy_clk)
-	_REGISTER_CLOCK("imx-wdt.1", NULL, dummy_clk)
+	_REGISTER_CLOCK("imx2-wdt.0", NULL, dummy_clk)
+	_REGISTER_CLOCK("imx2-wdt.1", NULL, dummy_clk)
 };
 
 static struct clk_lookup mx53_lookups[] = {