ARM: 6644/1: mach-ux500: update the U8500 defconfig

Config and activate all the devices we've merged for Ux500
in 2.6.38-rc1. This is needed for the default config to compile
properly.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>