Add LP3987H-33B5F and LP3992-18B5F LDOs from LOWPOWER
Datasheet LP3992-18B5F: https://datasheet.lcsc.com/lcsc/2304140030_LOWPOWER-LP3992-18B5F_C324569.pdf
Datasheet LP3987H-33B5F: https://datasheet.lcsc.com/lcsc/2004271836_LOWPOWER-LP3987H-33B5F_C517256.pdf
Edited by Petr Hodina