Bug#1060682: u-boot-sifive: Unable to boot from NVME via SPI on Hifive Unmatched Rev B

[Heinrich Schuchardt]

Related Launchpad bug:

HiFive Unmatched: __wrpll_calc_filter_range: post-divider reference freq 
out of range: 4294967295
https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/2054091