Bluetooth: Add l2cap-disconnect command to btshell
Bluetooth: Add l2cap-disconnect command to btshell

l2cap-disconnect can be used to disconnect or cancel a connection to
a server:

btshell> l2cap-disconnect
bt: bt_l2cap_chan_disconnect (0x0011260c): chan 0x0011065c scid 0x0040 dcid 0x0040
btshell> bt: bt_l2cap_recv (0x00114e00): Packet for CID 5 len 8
bt: l2cap_chan_recv (0x00114e00): chan 0x00111534 len 8
bt: l2cap_recv (0x00114e00): LE signaling code 0x07 ident 2 len 4
bt: le_disconn_rsp (0x00114e00): dcid 0x0040 scid 0x0040
bt: l2cap_chan_del (0x00114e00): conn 0x001111c0 chan 0x0011065c cid 0x0040
Channel 0011065c disconnected

Change-Id: If249748f98f9b006e4eb2f8722a6f698b372d959
Signed-off-by: Luiz Augusto von Dentz <8530c5ea66a1bdbc08f98bfcf183c8be901b5990@intel.com>

pklazy/zephyr,zephyriot/zephyr,bboozzoo/zephyr,GiulianoFranchetto/zephyr,fbsder/zephyr,sharronliu/zephyr,aceofall/zephyr-iotos,tidyjiang8/zephyr-doc,nashif/zephyr,coldnew/zephyr-project-fork,zephyrproject-rtos/zephyr,galak/zephyr,runchip/zephyr-cc3200,zephyrproject-rtos/zephyr,runchip/zephyr-cc3200,runchip/zephyr-cc3200,finikorg/zephyr,finikorg/zephyr,sharronliu/zephyr,rsalveti/zephyr,GiulianoFranchetto/zephyr,runchip/zephyr-cc3220,zephyrproject-rtos/zephyr,fbsder/zephyr,coldnew/zephyr-project-fork,mirzak/zephyr-os,bboozzoo/zephyr,explora26/zephyr,holtmann/zephyr,jamesonwilliams/zephyr-kernel,zephyriot/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,finikorg/zephyr,runchip/zephyr-cc3200,kraj/zephyr,punitvara/zephyr,runchip/zephyr-cc3220,bigdinotech/zephyr,nashif/zephyr,fractalclone/zephyr-riscv,aceofall/zephyr-iotos,jamesonwilliams/zephyr-kernel,mirzak/zephyr-os,sharronliu/zephyr,zephyriot/zephyr,mirzak/zephyr-os,aceofall/zephyr-iotos,runchip/zephyr-cc3220,explora26/zephyr,rsalveti/zephyr,bboozzoo/zephyr,nashif/zephyr,fractalclone/zephyr-riscv,zephyriot/zephyr,sharronliu/zephyr,nashif/zephyr,fbsder/zephyr,zephyrproject-rtos/zephyr,32bitmicro/zephyr,fractalclone/zephyr-riscv,GiulianoFranchetto/zephyr,bigdinotech/zephyr,bboozzoo/zephyr,tidyjiang8/zephyr-doc,Vudentz/zephyr,Vudentz/zephyr,32bitmicro/zephyr,tidyjiang8/zephyr-doc,pklazy/zephyr,erwango/zephyr,holtmann/zephyr,holtmann/zephyr,ldts/zephyr,runchip/zephyr-cc3200,erwango/zephyr,Vudentz/zephyr,fbsder/zephyr,kraj/zephyr,bboozzoo/zephyr,explora26/zephyr,coldnew/zephyr-project-fork,galak/zephyr,galak/zephyr,rsalveti/zephyr,sharronliu/zephyr,galak/zephyr,holtmann/zephyr,holtmann/zephyr,GiulianoFranchetto/zephyr,kraj/zephyr,fbsder/zephyr,pklazy/zephyr,mirzak/zephyr-os,coldnew/zephyr-project-fork,fractalclone/zephyr-riscv,32bitmicro/zephyr,mbolivar/zephyr,pklazy/zephyr,erwango/zephyr,rsalveti/zephyr,kraj/zephyr,erwango/zephyr,punitvara/zephyr,galak/zephyr,mirzak/zephyr-os,mbolivar/zephyr,jamesonwilliams/zephyr-kernel,punitvara/zephyr,ldts/zephyr,jamesonwilliams/zephyr-kernel,ldts/zephyr,fractalclone/zephyr-riscv,bigdinotech/zephyr,explora26/zephyr,32bitmicro/zephyr,jamesonwilliams/zephyr-kernel,finikorg/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,32bitmicro/zephyr,zephyriot/zephyr,coldnew/zephyr-project-fork,runchip/zephyr-cc3220,aceofall/zephyr-iotos,Vudentz/zephyr,tidyjiang8/zephyr-doc,mbolivar/zephyr,nashif/zephyr,explora26/zephyr,punitvara/zephyr,runchip/zephyr-cc3220,pklazy/zephyr,bigdinotech/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,tidyjiang8/zephyr-doc,erwango/zephyr,rsalveti/zephyr,finikorg/zephyr,ldts/zephyr,bigdinotech/zephyr,mbolivar/zephyr,Vudentz/zephyr,ldts/zephyr