Staging: lustre: ptlrpc: pack_generic: Declare local functions as static

Declare functions lustre_swab_ldlm_lock_desc and dump_obdo as static since
they are used only in this particular file. Also remove them from
corresponding header files.

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>