src: Add SPDX License Identifier

src: Add SPDX License Identifier

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

-------------------------------------
       License            COUNT
-------------------------------------
 LGPL-2.1-or-later    :     62
 GPL-2.0-or-later     :     51
 BSD-2-Clause         :      2

License: LGPL-2.1-or-later
   src/adv_monitor.c
   src/adv_monitor.h
   src/shared/mainloop-glib.c
   src/shared/btp.c
   src/shared/tester.c
   src/shared/btsnoop.c
   src/shared/gatt-helpers.h
   src/shared/log.h
   src/shared/util.h
   src/shared/mainloop-ell.c
   src/shared/hci-crypto.c
   src/shared/mainloop.c
   src/shared/hfp.h
   src/shared/mainloop-notify.c
   src/shared/io-mainloop.c
   src/shared/btsnoop.h
   src/shared/uhid.h
   src/shared/util.c
   src/shared/ringbuf.c
   src/shared/btp.h
   src/shared/shell.h
   src/shared/io-glib.c
   src/shared/queue.h
   src/shared/gatt-server.h
   src/shared/crypto.c
   src/shared/crypto.h
   src/shared/io-ell.c
   src/shared/timeout-glib.c
   src/shared/mgmt.c
   src/shared/gatt-db.c
   src/shared/mainloop-notify.h
   src/shared/hfp.c
   src/shared/timeout-ell.c
   src/shared/shell.c
   src/shared/hci.c
   src/shared/log.c
   src/shared/ringbuf.h
   src/shared/gatt-helpers.c
   src/shared/queue.c
   src/shared/tty.h
   src/shared/timeout-mainloop.c
   src/shared/tester.h
   src/shared/gap.h
   src/shared/mgmt.h
   src/shared/gatt-db.h
   src/shared/uhid.c
   src/shared/mainloop.h
   src/shared/timeout.h
   src/shared/att-types.h
   src/shared/pcap.c
   src/shared/gap.c
   src/shared/att.c
   src/shared/pcap.h
   src/shared/hci.h
   src/shared/gatt-client.h
   src/shared/io.h
   src/shared/gatt-client.c
   src/shared/ad.c
   src/shared/att.h
   src/shared/gatt-server.c
   src/shared/hci-crypto.h
   src/shared/ad.h

License: GPL-2.0-or-later
   src/attrib-server.h
   src/advertising.h
   src/textfile.c
   src/attrib-server.c
   src/uinput.h
   src/log.h
   src/eir.h
   src/sdpd.h
   src/sdpd-request.c
   src/service.h
   src/sdpd-database.c
   src/adapter.h
   src/plugin.h
   src/uuid-helper.h
   src/plugin.c
   src/main.c
   src/sdp-xml.c
   src/error.h
   src/oui.c
   src/device.c
   src/agent.h
   src/sdp-client.c
   src/oui.h
   src/device.h
   src/gatt-database.c
   src/error.c
   src/backtrace.c
   src/sdpd-server.c
   src/adapter.c
   src/log.c
   src/agent.c
   src/backtrace.h
   src/sdp-xml.h
   src/hcid.h
   src/dbus-common.h
   src/uuid-helper.c
   src/storage.c
   src/profile.c
   src/advertising.c
   src/storage.h
   src/dbus-common.c
   src/profile.h
   src/sdpd-service.c
   src/eir.c
   src/sdp-client.h
   src/gatt-database.h
   src/gatt-client.h
   src/rfkill.c
   src/gatt-client.c
   src/service.c
   src/textfile.h

License: BSD-2-Clause
   src/shared/ecc.h
   src/shared/ecc.c

Change-Id: Ib1c3dec2724d329657c0c4003375bbbe50bcf578
Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>