native: console: Fix Kconfig "multiple prompts" warnings
native: console: Fix Kconfig "multiple prompts" warnings

NATIVE_POSIX_STDIN_CONSOLE and NATIVE_POSIX_STDOUT_CONSOLE have more
than one prompts, this will cause warnings when run kconfig checks.

Remove one of two prompts.

Signed-off-by: Ding Tao <07dff04f1a3ec2456623b40cc3a82a04949e5843@qq.com>

explora26/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,mbolivar/zephyr,zephyriot/zephyr,nashif/zephyr,zephyriot/zephyr,ldts/zephyr,punitvara/zephyr,punitvara/zephyr,finikorg/zephyr,kraj/zephyr,kraj/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,Vudentz/zephyr,mbolivar/zephyr,finikorg/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,galak/zephyr,zephyriot/zephyr,Vudentz/zephyr,galak/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,ldts/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,Vudentz/zephyr,ldts/zephyr,galak/zephyr,explora26/zephyr,nashif/zephyr,Vudentz/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,Vudentz/zephyr,galak/zephyr,mbolivar/zephyr,kraj/zephyr,kraj/zephyr