x86: select CONFIG_THREAD_STACK_INFO for exception stack trace

When CONFIG_X86_EXCEPTION_STACK_TRACE is enabled, also forcibly
enable CONFIG_THREAD_STACK_INFO. Without the thread stack info,
it is possible the stack unwinding would go out of the thread
stack and into unknown memory, resulting in hard fault.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>