mbed library sources 只保留l0和l1系列的库,修改l0的库的晶振为12m

Dependents:   SANFAN_read_analog_value nucleo-wdg Nucleo_sleep_copy

Fork of mbed-src by mbed official

.yotta_ignore/shortlog/shortlog@9c82b0f79f3d: not found in manifest