since the related code was removed by:
commit 4d5a964f29
Author: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>
Date: Tue Feb 23 18:04:13 2021 +0800
net: unify socket into file descriptor
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Ported from stm32f7/h7: If configured this way, ramp-up the LSE crystal
oscillator driving strength until the LSE starts up.
Signed-off-by: Michael Jung <mijung@gmx.net>