ARM: bcm283x: Switch to generic timer

Switch to generic timer implementation from lib/time.c .
This also fixes a signed overflow which was in __udelay()
implementation.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Tyler Baker <tyler.baker@linaro.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
diff --git a/arch/arm/mach-bcm283x/Makefile b/arch/arm/mach-bcm283x/Makefile
index ac27d00..f0dadd0 100644
--- a/arch/arm/mach-bcm283x/Makefile
+++ b/arch/arm/mach-bcm283x/Makefile
@@ -5,4 +5,4 @@
 #
 
 obj-$(CONFIG_TARGET_RPI) += lowlevel_init.o
-obj-y	+= init.o reset.o timer.o mbox.o phys2bus.o
+obj-y	+= init.o reset.o mbox.o phys2bus.o