I'm considering adding support for the NUCLEO-L4R5ZI or NUCLEO-L476RG
boards, but they use the 'newer' STM32L4+ series processors. I was
wondering whether or not it constitutes a new soc/st_stm32/stm32l4+
directory, or if I could just reuse the stm32l4.
Looking through it, it seems that keeping them merged makes the most
sense. It's what's currently done in the HAL drivers.