`cmd_perf` isn't doing anything meaningful, remove it so that
the help message will be printed when invoked. Updated
the help message of the main command.
```
uart:~$ perf
perf - Lightweight profiler
Subcommands:
record : Start recording for <duration> ms on <frequency> Hz
Usage: record <duration> <frequency>
printbuf : Print the perf buffer
```
Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>
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| .. | ||
| perf | ||
| CMakeLists.txt | ||
| Kconfig | ||