RealView: Update the realview_defconfig file to a newer kernel

The original file was based on 2.6.14-rc2. Apart from the new symbols,
the explicitly enabled features are AACI, MMC, AEABI,
MACH_REALVIEW_PB1176 and MACH_REALVIEW_PB11MP.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>