ARM, SOS: Fix fail to load libsos.so while debugging with lldb

ARM, SOS: Fix fail to load libsos.so while debugging with lldb

Related issue: #4428
With minor fix for ARM compile in SOS

ARM: Fix ARM-Linux in SOS with lldb

Fix ARM architecture type in SOS so that it works for ARM-Linux.
Before this patch, lldb stops with architecture not supported.
SOS ARM-Linux works with LLDB-3.8 and higher.
Actual SOS commands for ARM may need testing and fixing.