A large part of the content of the bug.h is repeated among all
architectures, so it was decided to create a new config
CONFIG_GENERIC_BUG_FRAME.

The version of <bug.h> from x86 was taken as the base version.

The patch introduces the following stuff:
  * common bug.h header
  * generic implementation of do_bug_frame
  * new config CONFIG_GENERIC_BUG_FRAME

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>