ext/hal/stm32l0xx: Remove stm32l0xx_ll_usb from CMakeLists

STM32Cube doesn't provide a USB LL API for STM32L0XX series.
This patch removes stm32l0xx_ll_usb.c from CMakeLists because
it doesn't exist.

Signed-off-by: Yannis Damigos <giannis.damigos@gmail.com>
1 file changed