Arch arm : Correctly handle unaligned access + arch_extension sec + cpu_alignment

Signed-off-by: zwliew <zhaoweiliew@gmail.com>
defconfig: Enabled CPU Aligned Access

Change-Id: I894382b2b3d1b42df48cb02862b6a96537b55a77
Signed-off-by: zwliew <zhaoweiliew@gmail.com>