In commit a589325405
("support/config-fragments/autobuild: rename br-riscv64-musl config"),
the RISC-V 64-bit musl toolchain config snippet was renamed, but the
toolchain.csv file was not updated accordingly.
Due to this, utils/genrandconfig was no longer able to generate any
configuration.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>