Bad AT+COPS command with plmn

[matsujirushi]

Description of defect

When set nsapi.default-cellular-plmn value at mbed_app.json, I got error.

[00018163ms][INFO][CELL]: AT TX ( 8): AT+CPIN?
[00018163ms][INFO][CELL]: AT TX ( 1): <cr>
[00018165ms][INFO][CELL]: AT RX ( 3): <cr><ln>+
[00018165ms][INFO][CELL]: AT RX ( 3): CPI
[00018168ms][INFO][CELL]: AT RX (16): N: READY<cr><ln><cr><ln>OK<cr><ln>
[00018176ms][INFO][CELL]: SIM is ready
[00018180ms][INFO][CELL]: AT TX (11): AT+COPS=1,2
[00018186ms][INFO][CELL]: AT TX ( 1): "
[00018191ms][INFO][CELL]: AT TX ( 5): 44052
[00018196ms][INFO][CELL]: AT TX ( 1): "
[00018201ms][INFO][CELL]: AT TX ( 1): <cr>
[00018206ms][INFO][CELL]: AT RX ( 9): <cr><ln>ERROR<cr><ln>

https://github.com/ARMmbed/mbed-os/blob/master/features/cellular/framework/AT/AT_CellularNetwork.cpp#L227

Need a comma.

Target(s) affected by this defect ?

WIO_3G

Toolchain(s) (name and version) displaying this defect ?

GCC_ARM

What version of Mbed-os are you using (tag or sha) ?

mbed-os-5.14.2

[AriParkkila]

@matsujirushi Thanks for reporting, fix in PR #12088.

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOTRIAGE-2467