sys/console: Simplify ignoring non nlip input
sys/console: Simplify ignoring non nlip input

Now that code that handles nlip is in one function
there is no need to check variable 'g_console_ignore_non_nlip'
in many places.

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core