obexd: Add SPDX License Identifier

obexd: Add SPDX License Identifier

This patch adds SPDX License Identifier and removes the license text.

-------------------------------------
       License            COUNT
-------------------------------------
 GPL-2.0-or-later     :     65

License: GPL-2.0-or-later
   obexd/src/mimetype.c
   obexd/src/transport.h
   obexd/src/server.c
   obexd/src/obex.c
   obexd/src/log.h
   obexd/src/service.h
   obexd/src/plugin.h
   obexd/src/plugin.c
   obexd/src/main.c
   obexd/src/mimetype.h
   obexd/src/transport.c
   obexd/src/obexd.h
   obexd/src/obex.h
   obexd/src/obex-priv.h
   obexd/src/log.c
   obexd/src/map_ap.h
   obexd/src/manager.c
   obexd/src/service.c
   obexd/src/server.h
   obexd/src/manager.h
   obexd/plugins/opp.c
   obexd/plugins/vcard.h
   obexd/plugins/pbap.c
   obexd/plugins/vcard.c
   obexd/plugins/messages.h
   obexd/plugins/phonebook.h
   obexd/plugins/pcsuite.c
   obexd/plugins/messages-tracker.c
   obexd/plugins/phonebook-tracker.c
   obexd/plugins/irmc.c
   obexd/plugins/ftp.c
   obexd/plugins/ftp.h
   obexd/plugins/filesystem.c
   obexd/plugins/messages-dummy.c
   obexd/plugins/phonebook-ebook.c
   obexd/plugins/syncevolution.c
   obexd/plugins/bluetooth.c
   obexd/plugins/phonebook-dummy.c
   obexd/plugins/filesystem.h
   obexd/plugins/mas.c
   obexd/client/transport.h
   obexd/client/opp.c
   obexd/client/pbap.c
   obexd/client/transfer.h
   obexd/client/opp.h
   obexd/client/driver.c
   obexd/client/map-event.h
   obexd/client/bluetooth.h
   obexd/client/sync.h
   obexd/client/transport.c
   obexd/client/pbap.h
   obexd/client/driver.h
   obexd/client/transfer.c
   obexd/client/ftp.c
   obexd/client/map.h
   obexd/client/ftp.h
   obexd/client/bluetooth.c
   obexd/client/manager.c
   obexd/client/session.h
   obexd/client/session.c
   obexd/client/map.c
   obexd/client/sync.c
   obexd/client/map-event.c
   obexd/client/mns.c
   obexd/client/manager.h

Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>