arm920t/at91: use new clock.c features

This patch enables the new clock features from arm920t/at91/clock.c. This
is an required step to get at91rm9200_usart replaced by atmel_usart driver.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Cc: Jens Scharsig <js_at_ng@scharsoft.de>
Cc: Eric Bénard <eric@eukrea.com>
diff --git a/arch/arm/cpu/arm920t/at91/Makefile b/arch/arm/cpu/arm920t/at91/Makefile
index 8258ecd..4417dfe 100644
--- a/arch/arm/cpu/arm920t/at91/Makefile
+++ b/arch/arm/cpu/arm920t/at91/Makefile
@@ -29,6 +29,7 @@
 COBJS	+= reset.o
 COBJS	+= timer.o
 COBJS	+= clock.o
+COBJS	+= cpu.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))