Adds a standard DONT_CARE pin name that allows specifying that any pin will
work in a pin map.  This is currently used in the NRF51822 serial API to allow
specifying any pins as a UART.
Revert "Adds a standard DONT_CARE pin name that allows specifying that any pin will..."

This reverts commit c804dc8013bb067d0281f082ed28c5e07aca0541.
Disables checking UART pins checking on nRF51822.
Change pins for RBL nRF51822 board.
use target group LPC11UXX
[NUCLEO_L053R8] Bug fix and improvement of AnalogIn hal