Add commands for linux-kernel target

This patch implements a "lsmod", "struct" and, "offset" command to work with
the new linux-kernel target. The commands are a handy byproduct from
development and crude hacks. I don't expect them to be accepted in the
current state.  Nevertheless there needs to be an discussion on how and
where (see gdb/python scrips in kernel sources) to implement them. So here
is the start for it.

gdb/Changelog:

    * lk-cmds.h: New file.
    * lk-cmds.c: New file.
    * lk-low.c: Include lk-cmds.h.
    (lk_try_push_target): Init commands.
    * typeprint.c: Remove unnecessary forward declarations.
    (whatis_exp): Remove static.
    * typeprint.h (whatis_exp): New export.
    * Makefile.in (SFILES, ALLDEPFILES): Add lk-cmds.c.
    (HFILES_NO_SRCDIR): Add lk-cmds.h.
    (COMMON_OBS): Add lk-cmds.o.

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