fix(matter): c6 shall not use openthread

[SuGlider]

Description

The Matter library supports WiFi only at this point.
ESP32-C6 shall only use WiFi and do not start OpenThread both can't coexist.

Related

ESP-ROM:esp32c6-20220919
Build:Sep 19 2022
rst:0xc (SW_CPU),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x4001975a
SPIWP:0xee
mode:DIO, clock div:2
load:0x40875720,len:0x1190
load:0x4086c110,len:0xd98
load:0x4086e610,len:0x2e84
entry 0x4086c110

assert failed: esp_err_t openthread_init_stack() OpenthreadLauncher.cpp:161 (s_platform_config)
Core  0 register dump:
MEPC    : 0x408013d8  RA      : 0x4080891a  SP      : 0x4083a3a0  GP      : 0x40814c84  
TP      : 0x4083a600  T0      : 0x37363534  T1      : 0x7271706f  T2      : 0x33323130  
S0/FP   : 0x00000001  S1      : 0x4083a52f  A0      : 0x4083a404  A1      : 0x40818089  
A2      : 0x00000001  A3      : 0x00000029  A4      : 0x00000001  A5      : 0x40832000  
A6      : 0x0000000c  A7      : 0x76757473  S2      : 0x00000068  S3      : 0x4083a3f8  
S4      : 0x4083a3f8  S5      : 0x4219bd1b  S6      : 0x00000000  S7      : 0x00000000  
S8      : 0x00000000  S9      : 0x00000000  S10     : 0x00000000  S11     : 0x00000000  
T3      : 0x6e6d6c6b  T4      : 0x6a696867  T5      : 0x66656463  T6      : 0x62613938  
MSTATUS : 0x00001881  MTVEC   : 0x40800001  MCAUSE  : 0x00000007  MTVAL   : 0x00000000  
MHARTID : 0x00000000  

Testing

Check artifacts from this PR into Arduino Core 3.1.x