[cmake] make clean_TARGET cleans all targets

[stronnag]

make clean_TARGET should just clean the specified target, not all targets.

$ make MATEKF405 WINGFC MATEKF722
...
$ ls
bin             cmake_install.cmake       inav_2.6.0_WINGFC.hex
CMakeCache.txt  inav_2.6.0_MATEKF405.hex  Makefile
CMakeFiles      inav_2.6.0_MATEKF722.hex  src

then

$ make clean_MATEKF405
Scanning dependencies of target clean_MATEKF405
Removing intermediate files for MATEKF405
Built target clean_MATEKF405

should leave other targets, but:

[jrh@eeyore]$ ls
bin  CMakeCache.txt  CMakeFiles  cmake_install.cmake  Makefile  src

where have my other targets gone?

The following should be a no-op, instead it's a full build.

$ make MATEKF722
Generating MATEKF722/settings_generated.h, MATEKF722/settings_generated.c
Scanning dependencies of target MATEKF722.elf
...
Linking C executable ../../../../bin/MATEKF722.elf

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