[Telink] W91 OTA, Factory data commissioning fix

Fixes full config target commissioning for W91.
Been failing on `SendAttestationRequest` step,
finished with `general error 0x01`.

Tested manually with chip-tool on RPi on tlsr9118bdk40d

config/telink/chip-module/Kconfig.defaults

@@ -352,6 +352,7 @@ config CHIP_WIFI
 	select NET_IPV6_NBR_CACHE
 	select NET_STATISTICS_USER_API
 	imply MBEDTLS_ENTROPY_C
+    imply MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
 
 if CHIP_WIFI