ARM: add basic support for the Broadcom BCM2835 SoC

This SoC is used in the Raspberry Pi, for example.

For more details, see:
http://www.broadcom.com/products/BCM2835
http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf.

Initial support is enough to boot to a serial console, execute a minimal
set of U-Boot commands, download data over a serial port, and boot a
Linux kernel. No storage or network drivers are implemented.

GPIO driver originally by Vikram Narayanan <vikram186@gmail.com>
with many fixes from myself.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 3c67599..17f4b73 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -43,6 +43,7 @@
 COBJS-$(CONFIG_SH_GPIO_PFC)	+= sh_pfc.o
 COBJS-$(CONFIG_OMAP_GPIO)	+= omap_gpio.o
 COBJS-$(CONFIG_DB8500_GPIO)	+= db8500_gpio.o
+COBJS-$(CONFIG_BCM2835_GPIO)	+= bcm2835_gpio.o
 
 COBJS	:= $(COBJS-y)
 SRCS 	:= $(COBJS:.o=.c)