ARM: add Raspberry Pi model B board, using BCM2835 SoC

The Raspberry Pi model B uses the BCM2835 SoC, has 256MB of RAM,
contains an SMSC 9512 USB LAN/Hub chip, and various IO connectors.
For more details, see http://www.raspberrypi.org/.

Various portions (cache enable, MACH_TYPE setup, RAM size limit, stack
relocation to top of RAM) extracted from work by:
Oleksandr Tymoshenko <gonzo@bluezbox.com>.

GPIO driver enablement by Vikram Narayanan <vikram186@gmail.com>.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Tom Rini <trini@ti.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 5db80e1..403b8d1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -952,6 +952,10 @@
 	trimslice	Tegra2 (ARM7 & A9 Dual Core)
 	whistler	Tegra2 (ARM7 & A9 Dual Core)
 
+Stephen Warren <swarren@wwwdotorg.org>
+
+	rpi_b		BCM2835 (ARM1176)
+
 Thomas Weber <weber@corscience.de>
 
 	devkit8000	ARM ARMV7 (OMAP3530 SoC)