RealView: Update the realview-smp_defconfig file to a newer kernel

The original file was based on 2.6.19-rc3. Apart from the new symbols,
the explicitly enabled eatures are AEABI, REALVIEW_HIGH_PHYS_OFFSET and
MACH_REALVIEW_PB11MP.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>