subsys: logger: fix merge error

[aescolar]

Fix merge error introduced in:
ba01a39
(as part of #9362)
which deleted the native_posix backend for the logger.

Signed-off-by: Alberto Escolar Piedras alpi@oticon.com

Partially f ixes #10164
Needed by #10163

[nordic-krch]

thanks for fixing that.

[codecov-io]

Codecov Report

Merging #10172 into master will increase coverage by 0.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10172      +/-   ##
==========================================
+ Coverage   52.58%   53.03%   +0.45%     
==========================================
  Files         213      214       +1     
  Lines       26148    26177      +29     
  Branches     5636     5642       +6     
==========================================
+ Hits        13749    13884     +135     
+ Misses      10145    10024     -121     
- Partials     2254     2269      +15

Impacted Files	Coverage Δ
subsys/logging/log_backend_native_posix.c	89.65% <0%> (ø)
include/logging/log_msg.h	84.84% <0%> (+3.03%)	⬆️
subsys/logging/log_msg.c	85.92% <0%> (+3.7%)	⬆️
boards/posix/native_posix/tracing.c	48.71% <0%> (+5.12%)	⬆️
subsys/logging/log_output.c	66.24% <0%> (+63.69%)	⬆️

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