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

[Heinrich Schuchardt]

Upstream patch create:

[PATCH 1/1] serial: move sbi_dbcn_available to .data section
https://lists.denx.de/pipermail/u-boot/2024-February/546790.html