Add esp32c6 coremark and esp32s3 ostest defconfig

[eren-terzioglu]

Fixes #17721 and #17720 issues

Summary

• boards/risc-v/esp32c6: Add coremark defconfig

Add coremark defconfig for esp32c6-devkitc

• boards/risc-v/esp32c6: Add coremark defconfig

Add coremark defconfig for esp32c6-devkitc

• Docs/platforms/esp32s3: Add ostest docs

Add ostest defconfig for esp32s3

Impact

Impact on user: No

Impact on build: No

Impact on hardware: No

Impact on documentation: Yes, added defconfig docs added

Impact on security: No

Impact on compatibility: No

Testing

Used these configs:

esp32c6-devkitc:coremark
esp32s3-devkit:ostest

Building

These command used to build

make distclean && ./tools/refresh.sh esp32c6-devkitc:coremark && make -j && make download ESPTOOL_PORT=/dev/ttyUSB0 ESPTOOL_BAUD=921600 ESPTOOL_BINDIR=./

Running

Coremark will run on startup, ostest app run with entering ostest command on cmd

Results

Coremark output:

...
Running CoreMark...
2K performance run parameters for coremark.
CoreMark Size    : 666
Total ticks      : 1371
Total time (secs): 13.710000
Iterations/Sec   : 437.636761
Iterations       : 6000
Compiler version : GCC14.2.0
Compiler flags   : -O3 -fno-strict-aliasing -fomit-frame-pointer -ffunction-sections -fdata-sections -nostdlib
Memory location  : HEAP
seedcrc          : 0xe9f5
[0]crclist       : 0xe714
[0]crcmatrix     : 0x1fd7
[0]crcstate      : 0x8e3a
[0]crcfinal      : 0xa14c
Correct operation validated. See README.md for run and reporting rules.
CoreMark 1.0 : 437.636761 / GCC14.2.0 -O3 -fno-strict-aliasing -fomit-frame-pointer -ffunction-sections -fdata-sections -nostdlib / HEAP

ostest output:

nsh> ostest
...
ostest_main: Exiting with status 0

[cederom]

Wow big thank you @eren-terzioglu !! :-)

[jerpelea]

please write proper PR titles
area: meaningful message

ex:
boards/espressiff: add ostest config