mcumgr: Probably incorrect error handling with udp backend

[eobalski]

In case there is no free space for mcumgr buffer, received data are probably
inproperly dropped smp_udp.c:114-127.

For more information refer to:
#37105
#37081

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[carlescufi]

@emob-nordic are you looking into this?

[eobalski]

@carlescufi I'm not. I was told in the past to write this issue so someone competent could address it later.

[carlescufi]

@aunsbjerg could you please take a look at this issue?

[aunsbjerg]

@carlescufi I will try, but am a bit pressed for time, so it will be a few days before I can do anything

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[de-nordic]

I'll take over. I have idea how to follow with this, although it requires change in mcumgr/lib.

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[nordicjm]

@de-nordic the file has since moved and changed, what parts are wrong in the UDP handling?

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[nordicjm]

It is assumed that this is a duplicate of #44536 whereby if there are insufficient buffers to receive the command, no error response is sent.