[STM32L0] Update version in files, add Cube driver release note
[STM32L0] Update registers map file
[STM32L0] Remove useless files
[NUCLEO_L053R8] Update GPIO structures

Due to latest registers map file used.
Merge pull request #644 from bcostm/master

Targets: Nucleo: Update of STM32L0 Cube driver + NUCLEO_L053R8 hal