m68knommu: Rename m548x_wdt.c to m54xx_wdt.c

All m548x files were renamed to m54xx, except m548x_wdt.c.  Fix that.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index dd77665..20e44c4 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -106,7 +106,7 @@
 # M32R Architecture
 
 # M68K Architecture
-obj-$(CONFIG_M548x_WATCHDOG) += m548x_wdt.o
+obj-$(CONFIG_M54xx_WATCHDOG) += m54xx_wdt.o
 
 # MIPS Architecture
 obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o